A population that is decreasing in size can be due to factors such as low birth rates, high death rates, emigration exceeding immigration, or environmental changes affecting reproductive success. Genetic diversity plays a crucial role in the vulnerability of a population to decline, making it more susceptible to recessive lethal alleles and changing environmental conditions. The extinction vortex describes how declining populations face increasing risks of extinction due to loss of genetic diversity, inbreeding depression, and other factors.
1. Pairs of chromosomes with the same traits are called ______________________ pairs. 2. Sex cells, like sperm and eggs, have only half a set of chromosomes making them ____________ cells. 3. What process creates haploid sex cells (gametes)? 4. Where does meiosis take place in males? 5. Where does meiosis take place in females? 6. When chromosomes exchange traits this is called ___________________. 7. Which pair of chromosomes determines sex of the offspring? 8. What is the separation of the two cells following cleavage? 9. How many new cells are produced at the end of telophase II? 10. Of the four female gametes created only one become an _____ and the other three become __________ bodies.
Pairs of chromosomes with the same traits are called homologous pairs. Sex cells, like sperm and eggs, have only half a set of chromosomes making them haploid cells. The process that creates haploid sex cells (gametes) is called meiosis.
Explanation:1. Pairs of chromosomes with the same traits are called homologous pairs.
2. Sex cells, like sperm and eggs, have only half a set of chromosomes making them haploid cells.
3. The process that creates haploid sex cells (gametes) is called meiosis.
4. Meiosis takes place in the testes of males.
5. Meiosis takes place in the ovaries of females.
6. When chromosomes exchange traits, this is called crossover.
7. The pair of chromosomes that determines the sex of the offspring is the sex chromosomes (usually X and Y chromosomes).
8. The separation of the two cells following cleavage is called cytokinesis.
9. At the end of telophase II, four new cells are produced.
10. Of the four female gametes created, only one becomes an egg or ovum, and the other three become polar bodies that eventually disintegrate.
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During DNA replication, which sequence of nucleotides will bond to the sequence ACGTAT?
A. TCGATA
B. UGCAUA
C. TGCATA
D. UCGUAU
Ans.
DNA replication involves formation of two identical copies from DNA from a single parent DNA molecule. The parent DNA strands act as template, and new DNA strands are made by DNA polymerase enzyme, complementary to parent strands.
According to base-pair rule, adenine (A) pairs with thymine (T) and Guanine (G) pairs with cytosine (C). Thus, the sequence TGCATA will bind to the sequence ACGTAT.
Thus, the correct answer is 'option C). TGCATA.'
Mutagens such as pollutants and UV light can cause mutations in DNA to occur at a higher rate than normal. These mutations may be beneficial in some cases, but often they lead to cancer. Which of the following best describes how cancer cells affect the body? ...?
a. They cause the immune system to produce antibodies, which attack healthy cells along with the cancer cells.
b. They consume normal cells and use them as fuel to reproduce and attack more healthy cells.
c. They have an abnormally short cell cycle, and they die faster than the liver is able to remove them from the body.
d. They take nutrients needed by healthy cells, and as they grow they interfere with the function of normal cells and organs.
Correct answer: D). They take nutrients needed by healthy cells, and as they grow they interfere with the function of normal cells and organs.
Cancer is uncontrolled growth of the cell in the body. The Old cell does not die and instead of that, they have grown out of control, which results in the formation of new abnormal cells. These may form a mass of tissue called a tumor.
Due to uncontrolled growth of a cell, the normal function of neighboring tissue or organ may be disturbed or it might damage vital organ such as kidney, heart, lung etc and may cause death.
Answer:
d. They take nutrients needed by healthy cells, and as they grow they interfere with the function of normal cells and organs.
Explanation:
Cancer is the rapid production of cells. Many cancer cells have a defect in a gene called p53, which is responsible for delaying the cell cycle until all chromosomes are replicated. Mutations or damage to this gene make cells unable to respond to the signals that normally control their growth and division
which substance acts as a buffer in natural water
The material which acts as a buffer in natural water is - Decomposing animal elements. Adding these elements will probably combat PH difference if another acid or base are combined. This will create an atmosphere where we could sustain the pH of the solution to be extremely stable
distinguish between monogenic & polygenic inheritance ...?
Metabolism is _____.
1. a measure of the hydrogen ion concentration in a solution
2. the energy required to start a chemical reaction
3. all of the chemical reactions in an organism required to sustain life
4. a chemical reaction in which the substrates trade constituent parts
Answer: 3 : All of the chemical reactions in an organism required to sustain life.
Explanation: Metabolism is the process of converting food into energy form ( ATP). Metabolism is set of biochemical reactions which is completed in presence of necessary enzymes and is essential to sustain life.
Which of the following best describes integrated pest management?
A. The practice of using pesticides early in the growing season to minimize pest populations
B. The practice of using biological, cultural, environmental, and chemical means to control pests
C. The practice of using no synthetic fertilizers or pesticides to control pests
D. The practice of using only strong pesticides to control pests
Answer:
The correct answer for: Which of the following best describes integrated pest management? Is: B. The practice of using biological, cultural, environmental, and chemical means to control pests
Explanation:
To understand this answer we need to remember what IPM of integrating pest management is. IPM is the combination of biological, cultural, environmental and chemical means to minimize the local threat of pests in the crop or area of attention. First of all the objective is not to eradicate, exterminate or extinguish. But control them in other words, they will still be there but won't mean damage or danger to the crop or zone. Now, IPM seeks to do the least amount of damage to humans and the pests. So pesticides and fungicides are not welcomed in it. So, IPM is a whole strategy of changing the environment so that those pests won't mean an economical threat.
Which process will decrease the level of CO2 in the atmosphere? growing trees cutting trees burning trees increasing the human population
in rabbits, B represents the allele for black coat and b represents the allele for a white coat. black is dominant over white. if a rabbit has the genotype BB what is the rabbits phenotype?
a) gray
b)black
c)white
d)BB X bb
Answer:
Black
Explanation:
A dominant allele for a given gene is the one that can express itself in both homozygous as well as heterozygous conditions.In the given question it has been stated that the allele B is dominant over b, and since the allele B codes for black coat color, this means that the rabbit having the phenotype BB will have black coat color.Astronomers claim that objects throughout the universe are made of the same chemical elements that exist here on Earth. Given that most of these objects are so far away that we can never hope to visit them, why are astronomers so confident that the objects are made from the same set of chemical elements, rather than completely different substances?
First one to answer these science questions will get brainliest/5 star/ thanks
7. Which is most like a glacier changing Earth's land?
A. a bird lapping water from a puddle
B. a boy raking leaves into a pile
C. a stream rushing down a hill
D. a bulldozer pushing and piling anything in its path
8. Which of the following weather events can help nature?
A. floods
B. tornadoes
C. hurricanes
D. landslides
9. Which of the following describes how sediment (weathered rock and soil) moves from one place to another?
A. Flying insects and birds carry it
B. it is carried through the roots of plants
C. It is carried by rapidly moving water
D. it is carried in the waste products of animals
10. Gravity pulls rainwater downhill and the flowing water erodes the landscape by _______.
A. forming sand dunes
B. washing away soil
C. forming a desert
D. moving rocks and boulders
11. What is one way that scientist learn about Earth's interior?
A. by comparing soil samples
B. by studying seismograms recorded during earthquakes
C. by using telescopes
D. by taking x-rays
12. What parts of Earth did glaciers cover during the Ice Age?
A. all of earth
B. only areas near the north pole and south pole
C. much of earth, including parts that are much warmer toady
D. only oceans, not land
What characteristic distinguishes the five groups of fungi?
Secretion of which hormone is controlled by a positive-feedback mechanism?
Progesterone
Testosterone
Oxytocin
Answer:
Oxytocin
Explanation:
Positive feedback mechanism is the one by which the changes leads to more changes of same type.
During child birth, the head of the baby is pressed against the cervix which in turn send the nerve impulses to brain. Brain makes the pituitary gland to secrete the hormone oxytocin. Oxytocin is released in blood and causes the uterine contraction. As labor continues, more stimulation of cervix and intense uterine contractions lead to more release of oxytocin.
Some biology students wanted to determine whether a pair of brown mice purchased at a pet store was homozygous dominant or heterozygous for fur color. They let the mice mate and examined the offspring. Six mice were born. All six had brown fur.
Some of the students felt that this was enough evidence to prove that the mice were homozygous for brown fur color. Other students did not, so another experiment was planned.
Describe the next experiment the students could conduct to determine whether the parent mice are homozygous brown or heterozygous. Explain your answer.
...?
Mark me brainiest answer is b
How does natural selection change the frequency of genes or traits over many generations? Biology students conducted an experiment mimicking genetic variation and coloration. Students used different colored beans to represent animals that might be prey: mice, for example. A student in each group was the predator: a hawk. Beans (mice) were randomly scattered on multicolored floor tiles, each color within four tiles. The hawk collected mice (beans) for 10 seconds. Mice not eaten reproduced. Three generations of data a shown in the table.
Speckled and striped beans (mice) had the best survival rates. Why?
A) They reproduced very rapidly.
B) Coloration was a form of camouflage.
C) They mimicked other mice and were spared.
D) The speckled and striped beans had a wider range.
If you examine a rock sample and observe fossils in it, what type of rock does the sample represent?
a. igneous
b. metamorphic
c. sedimentary
d. fossils are found in several of the types listed above
If you examine a rock sample and observe fossils in it, the type of rock that the sample represents is sedimentary. Sedimentary rocks are made of fragments of igneous rock or the shells of living organisms deposited by wind or water and cemented together without melting. Fossils can be preserved in sedimentary rocks, providing valuable information about past life forms and environments.
Explanation:If you examine a rock sample and observe fossils in it, the type of rock that the sample represents is sedimentary. Sedimentary rocks are made of fragments of igneous rock or the shells of living organisms deposited by wind or water and cemented together without melting. Fossils can be preserved in sedimentary rocks, providing valuable information about past life forms and environments.
help me out on #31 I would appreciate it thanks.
are puffer fish and balloon fish and blow fish the same thing
Final answer:
Puffer fish, balloon fish, and blowfish are different names given to the same type of fish that belong to the family Tetraodontidae . They can puff up their bodies to appear larger and intimidate predators, thanks to their elastic stomachs and the ability to store water or air in their bodies.
Explanation:
Puffer fish, balloon fish, and blowfish are all different names given to the same type of fish, which belong to the family Tetraodontidae. So, yes, puffer fish, balloon fish, and blowfish refer to the same thing.
These fish are known for their unique ability to puff up their bodies by swallowing water or air, which makes them appear larger and more intimidating to potential predators.
The inflation is possible due to the presence of elastic stomachs and the ability to store large amounts of water or air in their bodies. This unique adaptation helps protect them from predators. Therefore statement written above is true
a naked male corpse was found at 8 a.m. on Tuesday, July 9. The air temperature was already 26.7 degrees Celsius. The body exhibited some stiffness in the face and eyelids and had a body temperature of 34.4 degrees Celsius. Livor mortis was not evident. Approximately how long ago did the man die? CSI
The time of death for the man is estimated to be a few hours before his body was found at 8 a.m., possibly within a 2-6 hour timeframe based on the observed onset of rigor mortis and the body temperature of 34.4 degrees Celsius, as the body cools post-mortem. Further forensic evidence would be needed for a more precise determination.
Explanation:Estimating the time of death for the na ked male corpse found at 8 a.m. on Tuesday, July 9, can be approached by considering several forensic factors including body temperature (the post-mortem interval), rigor mortis, and livor mortis. The body temperature noted was 34.4 degrees Celsius, which is lower than the average normal body temperature of 37.0 degrees Celsius.
In general, after death, the body temperature falls by about 1-1.5 degrees Celsius per hour under normal conditions. However, the exact rate can be influenced by factors such as environmental temperature, the deceased's clothing, and body composition. Given that some stiffness was observed in the face and eyelids, we can infer the onset of rigor mortis, which typically begins within 2-6 hours post-mortem and is fully developed by approximately 12 hours. The absence of livor mortis suggests that the body may have been discovered fairly soon after death.
Combining these observations with known scientific data about normal body temperature ranges allows us to hypothesize that the man's death occurred a few hours before his body was found, potentially within a range of 2-6 hours prior to discovery given the onset of rigor mortis. However, this estimation can vary based on environmental conditions and the individual's specific circumstances at the time of death. It is important to note that while these methods can provide an estimate, they are not exact and should be corroborated with additional forensic evidence for a more accurate determination.
Coral reefs are built by a small organism called a polyp. The polyp creates the structure of the coral reef by building a ____________ out of calcium carbonate
cup
pocket
shelf
plate
The polyp creates the structure of the coral reef by building a calcium carbonate skeleton, which accumulates over time to form the reef, and provides benefits to marine life and shorelines.
Coral reefs are built by a small organism called a polyp. The polyp creates the structure of the coral reef by building a calcium carbonate skeleton. These skeletons are secreted by the coral polyps, and over time, they accumulate to form the structure of the coral reef. Coral reefs are important marine ecosystems, providing food and shelter for many ocean organisms and protecting shorelines from erosion. However, these vital structures are at risk due to human activities and other environmental factors.
This image is of a human embryo. It took many weeks of development to get to this stage. Prior to this, all of the human cells were not differentiated, and the organism would have simply looked like a grouping of all the same type of cells. What is the name given to the type of cells in humans that are not differentiated?
Leaves with carotenoid pigment turn _________ during the fall.
a. red and green
b. yellow and orange
c. green
d. brown and yellow
The correct answer is option (b). yellow and orange.
The carotene or tetraterpenoids is a class of pigment produced by many organism including plants and the fungi. This pigment gives the yellow and the orange color to the leaves.
Generally, the leaves are green colored, due to the presence of chlorophyll, but during the fall, the amount of chlorophyll is decreased and the carotene gives a orange or yellow color to the leaves.
Which one of the following choices is not a monosaccharide?
a. glucose.
b. fructose.
c. galactose.
d. sucrose.
Answer: The correct answer is- D) Sucrose.
Monosachharide is the simplest form of a sugar that can not be hydrolysed into any further simple form. It is also called as simple sugar.
Example of monosachharide- Glucose, fructose, galactose.
Sucrose is a disaccharide ( formed by two monosachharide units) as it is made up of two monosachharide that is glucose and fructose.
Sucrose is a disaccharide rather than a monosaccharide. Fructose and glucose are monosaccharides that combine to make sucrose. Sucrose is not a monosaccharide.
The simplest carbohydrates are monosaccharides, which are also known as simple sugars. The most frequent monosaccharides are unbranched single-bonded chains with three to six carbon atoms.
The most fundamental type of carbohydrates is monosaccharides. The majority of organisms convert monosaccharides like glucose into energy, which they then store or use as needed. The number of carbon atoms in this form of glucose and the functional group that is connected to it is used to classify it. Aldose is the name given to the monosaccharide that includes aldehyde, while ketose is the name given to the monosaccharide that has a ketone group.
Therefore, sucrose is not a monosaccharide.
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The adjustment of materials that follow a major earthquake often generates smaller earthquakes called?
Foreshocks
Surface waves
Aftershocks
Body waves
The right option is; Aftershocks
The adjustment of materials that follow a major earthquake often generates smaller earthquakes called aftershocks.
Aftershocks are lower intensity earthquakes that follow the main (largest) shock of an earthquake sequence. Aftershocks are usually smaller than the main shock, but they tend to be the most severe and occur more often in the hours and days after an earthquake. The larger the main shock, the larger the aftershocks. However, the intensity and magnitude of aftershocks reduces over time.
Which process results in the greatest ATP output? (1 point)
(a)Krebs cycle
(b)pyruvate oxidation
(c)glycolysis
(d)electron transport chain
If a male has a disease that is Y-linked, what percentage of his sons will inherit the disease?
Final answer:
Sons will have a 100% chance of inheriting a Y-linked disease from their father because they receive their father's Y chromosome.
Explanation:
If a male has a Y-linked disease, each of his sons will inherit the Y chromosome that carries the disease gene. Since males only have one Y chromosome and they inherit it directly from their fathers, the probability that a son will inherit a Y-linked disease from his affected father is 100%. This differs from X-linked genetic disorders, where the chance of inheritance varies depending on the mother's genotype and the sex of the offspring.
What is a tetrad?
A. A chromatid before meiosis
B. Another term for a sperm cell
C. A haploid cell produced by meiosis
D. Two sets of sister chromatids
A tetrad is a structure that forms during meiosis I, consisting of two sets of sister chromatids. It allows for the exchange of genetic material between homologous chromosomes, contributing to genetic variation in offspring.
A tetrad is a structure that forms during meiosis, the process of cell division that produces haploid cells such as sperm and egg cells. Specifically, a tetrad refers to two sets of sister chromatids that come together during meiosis I.
During meiosis I, homologous chromosomes pair up and undergo a process called synapsis. This pairing results in the formation of a tetrad, which consists of two homologous chromosomes, each consisting of two sister chromatids. The sister chromatids within each homologous chromosome are identical because they are replicated copies of the same chromosome.
The formation of a tetrad allows for the exchange of genetic material between the homologous chromosomes through a process called crossing over. Crossing over occurs when sections of DNA are swapped between the non-sister chromatids of the homologous chromosomes. This genetic recombination contributes to genetic variation in offspring.
After crossing over and genetic recombination have occurred, the tetrad undergoes separation during meiosis I. This results in the formation of two haploid cells, each containing one set of sister chromatids. These haploid cells are then further divided during meiosis II to produce four haploid cells, each containing a single set of chromosomes.
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what is a good sentence for the word absolute dating
Ques.what will happen if the stretch receptors of the urinary bladder wall are totally removed?
a)there will be no micturation
b)urine will not be collected in bladder
c)micturation will continue
d)urine will continue to collect normally in bladder Ques.what will happen if the stretch receptors of the urinary bladder wall are totally removed?
a)there will be no micturation
b)urine will not be collected in bladder
c)micturation will continue
d)urine will continue to collect normally in bladder
Enzymes effect the reactions in a living cell by changing the
A) products of the reaction
B) Speed of the reaction
C) Temperature of the Reaction
D) pH of the reaction
The brain is most active during which portion of each sleep cycle? A. the beginning of each sleep cycle B. the middle of each sleep cycle C. the end of each sleep cycle D. The brain is not active during the sleep cycle.
Answer:
B
Explanation:
Final answer:
The brain shows the highest level of activity similar to wakefulness during the REM stage of sleep, which normally occurs toward the end of each sleep cycle. So the correct option is C. the end of each sleep cycle.
Explanation:
The brain is most active during different portions of the sleep cycle. While we do go through stages of lighter and deeper sleep, the brain does not simply shut off. Instead, the brain goes through a series of complicated chemical changes and displays various brainwave activities throughout these stages. The REM portion of the sleep cycle, in particular, shows brainwave patterns that are very similar to those during wakefulness. If we're discussing the peak activity in terms of brainwave similarity to an awake state, the brain is most active during the REM stage, which tends to happen toward the end of each sleep cycle. Therefore, the answer to the question would be C. the end of each sleep cycle.