1) heritability

1. 1) heritability • A) is the proportion of genetic variation that is due to phenotypic variation • B) is a property of an individual, not a population • C) means that the trait is genetically based • D) can be measured from the resemblance among relatives • E) all of the above

2. 2) If R = h2S, and you measure selection on nose hair length to be S = -0.2 mm, and the heritability of nose hair length is known to be 0.5, then in one generation • A) nose hair length is predicted to increase by 0.1 mm • B) nose hair length is predicted to increase by 0.2 mm • C) nose hair length is predicted to decrease by 0.5 mm • D) nose hair length is predicted to decrease by 0.1 mm • E nose hair length is predicted to stay the same

3. 3) If the slope of kids’ nose hair length on their parent’s average nose hair length is 0.8 • A) then the trait is inherited but is not heritable • B ) then the trait has a heritability of 0.2 • C) then the trait might show a response to selection • D) then most of the variation in nose hair length is due to the environment • E) then longer nose hair is favored

4. 4) Most traits most of the time are • A) evolving rapidly • B) under disruptive selection • C) staying about the same • D) under net stabilizing selection • E) answers C and D above are both correct

5. 5) Suppose you impose artificial selection on bunch of dumb cows to try to increase their milk production. You impose a selection differential of 8 quarts of milk per day, and the dumb cows in the next generation produce on average 4 quarts of milk per day more than the average cow in their parental population did • A) milk production was not heritable • B) heritability of milk production was 0.5 • C) heritability of milk production was 1.0 • D) the offspring generation was not genetically different from the parental population