a. Why is heritability necessary for natural selection? How would you expect a trait for which...
a. Why is heritability necessary for natural selection? How would you expect a trait for which there is no resemblance between parents and offspring to change over time?
b. Why is differential success among organisms with different
variants of a trait necessary for natural selection? How would you
expect a trait for which there is no differential success to change
over time?
Homework Answers
Why is heritability necessary for natural selection? How would you expect a trait for which there is no resemblance between parents and offspring to change over time?
Heritability estimates the proportion of variation in a given trait. It measures the degree of variation in a phenotypic trait in a population due to genetic variation. Heritability is important for natural selection because natural selection is based on the superiority of an individual over other. This superiority can be considered as a desired variation in the phenotypic trait which is genetically heritable.
During evolution only desired traits get selected and inherited among the individuals as per the requirement in the given time. Due to variation several traits get changed over time in the offspring and these traits show no resemblance with parents. For instance, human tail has been gone during the course of evolution.
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a. Why is heritability necessary for natural selection? How
would you expect a trait for which...
How would you expect heritability to change if the same population of organisms was put in...
How would you expect heritability to change if the same population of organisms was put in a stressful environment? For example, how would you predict heritability of plant flower size would change if there were a severe drought? Why? (1 pt)
1. Genetic variation _____. A. is created by the direct action of natural selection B. must...
1. Genetic variation _____. A. is created by the direct action of natural selection B. must be present in a population before natural selection can act upon the population C. arises in response to changes in the environment D. tends to be reduced by when diploid organisms produce gametes 2. What is a genetic correlation? A. When selection favoring alleles for one trait causes a correlated but suboptimal change in an allele for another trait. B. When two offspring inherit...
Evolution by natural selection, initially described by Charles Darwin, is the theory that explains how a...
Evolution by natural selection, initially described by Charles Darwin, is the theory that explains how a population’s inherited traits change over time and describe why organisms must adapt to their environments. Evolutionary theory can explain how specialized features develop in different species.
How would you combine adoption and twin study techniques to determine the heritability of a trait?
How would you combine adoption and twin study techniques to determine the heritability of a trait?
1. Which of the following is/are required for natural selection to occur? A. The trait must...
1. Which of the following is/are required for natural selection to occur? A. The trait must be used or it will no longer be passed down B. Trait must be inherited from the father, not mother C. The species could produce more offspring than their environment can support D. Members of the population must have inherited traits that could vary E. Members must have an equal ability to survive and reproduce 2. Which of the following statements is/are true? A....
Which best describes how to estimate heritability? (a.) The regression slope of mean offspring phenotype versus...
Which best describes how to estimate heritability? (a.) The regression slope of mean offspring phenotype versus mean parent phenotype (b). The ratio of selection differential divided by selection response (c). Both a and b are true (d). Both a and b are false
Which of the following statements regarding natural selection is not true? It is a random process....
Which of the following statements regarding natural selection is not true? It is a random process. A favorable trait in one environment is not always a favorable trait in a different environment. It is a mechanism by which evolution may occur. It occurs even if the frequency of the specific trait doesn't change over many generations.
1. Natural Selection happens to a population, Does NOT happen to an individual. What is the difference between a population and an individual? What happens to populations with little or no variation...
1. Natural Selection happens to a population, Does NOT happen to an individual. What is the difference between a population and an individual? What happens to populations with little or no variation of genetic traits? 2. Which bean variety had an advantage? (what is your evidence?) 3. What characteristic (s) were advantageous? 4. Who or what did the selecting of the advantageous trait? 5. Did any bean variety have a disadvantage? (evidence?) 6. What changes might you expect to see...
How Does Evolutionary Change Occur? "I soon perceived that selection was the keystone of man's success...
How Does Evolutionary Change Occur? "I soon perceived that selection was the keystone of man's success in making useful races of animals and plants. But how selection could be applied to organisms living in a state of nature remained for some time a mystery to me." - Charles Darwin Introduction Fundamentally, evolution is the idea that the form and behaviors of a species are not fixed - that they can change over time. Before Darwin was even born, some scientists...
Q 14. Why do offspring resemble their parents, but only approximately? Some factors that might be...
Q 14. Why do offspring resemble their parents, but only approximately? Some factors that might be relevant would include quantitative-trait loci, the phenotypic variance, the additive genetic variance, and the environmental variance. Just dropping these names (and others) does not really explain anything, unless you say what they are and how they interact to affect the resemblance between parents and offspring. 11.01 • 1978 • 1976 Offspring beak depth (mm) 8.0 9.0 10.0 11.0 Midparent beak depth (mm)
How would you expect heritability to change if the same population of organisms was put in a stressful environment? For example, how would you predict heritability of plant flower size would change if there were a severe drought? Why? (1 pt)
Which of the following statements regarding natural selection is not true? It is a random process. A favorable trait in one environment is not always a favorable trait in a different environment. It is a mechanism by which evolution may occur. It occurs even if the frequency of the specific trait doesn't change over many generations.
How Does Evolutionary Change Occur? "I soon perceived that selection was the keystone of man's success in making useful races of animals and plants. But how selection could be applied to organisms living in a state of nature remained for some time a mystery to me." - Charles Darwin Introduction Fundamentally, evolution is the idea that the form and behaviors of a species are not fixed - that they can change over time. Before Darwin was even born, some scientists...
Q 14. Why do offspring resemble their parents, but only approximately? Some factors that might be relevant would include quantitative-trait loci, the phenotypic variance, the additive genetic variance, and the environmental variance. Just dropping these names (and others) does not really explain anything, unless you say what they are and how they interact to affect the resemblance between parents and offspring. 11.01 • 1978 • 1976 Offspring beak depth (mm) 8.0 9.0 10.0 11.0 Midparent beak depth (mm)
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