Question 1

Estimating heritability using twin studies has been useful for certain human phenotypes,such as general cognitive abilities.Explain the logic behind this,and how such studies are performed.

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Question 2

Some have proposed that where human IQ scores are concerned,heritability can tell us something about the causes of differences between population means such as ethnic groups.Explain why this perspective is erroneous.

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Question 3

Three distinct modes of selection have been proposed and studied in natural populations.Each mode is different in its effects on the mean value and distribution of phenotypes.Compare and contrast each of these three modes.

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Question 4

Suppose we consider the figures below.If Figure A represents a measurable trait in a population at time 0,and Figure B represents the same trait some generations later,we can conclude that the type of selection called ________ selection has been at work.

Figure A Figure B

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Question 5

In populations where individuals with intermediate values of a trait have the highest fitness,the average value of the trait does not change over time,but the variation tends to be reduced.This set of circumstances is known as ________.[two words]

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Question 6

________ selection and ________ selection tend to reduce the amount of variation in a population,whereas ________ selection tends to increase the amount of variation in a population.

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Question 7

It becomes possible to predict evolutionary changes in a population after we have measured two attributes affecting the population in question.What two measures allow us to make such predictions?

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Question 8

Compare and contrast qualitative traits/genetics with quantitative traits/genetics.

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Question 9

Explain,using examples/equations,the similarities and differences between broad-sense and narrow-sense heritability estimates.

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Question 10

In populations where individuals with extreme values of a trait have the highest fitness,the average value of the trait may not change,but the amount of variance in the trait does increase over time.This set of circumstances is known as ________.[two words]

Accepted Answer

The answer of In populations where individuals with extreme values...

Quiz 9: Evolution at Multiple Loci: Quantitative Genetics