1. Why is natural selection more effective in a large population than small one?
ID: 161824 • Letter: 1
Question
1. Why is natural selection more effective in a large population than small one?
2.
For a particular trait, Heritability (broad sense) = 0. This means that
a. the trait has no genetic basis
b. most of the phenotypic variation in the population is explained by differences in the alleles that individuals have
c. the phenotypic variation in the population is explained by differences in the environments experienced by individuals
d. both a and b are correct
3. Which of the following is true of QTL association studies?
a. they pinpoint the specific gene(s) responsible for phenotypic variation
b. F1 offspring are examined to look for genetic markers linked to phenotypic variation
c. they rely on recombination to create a wide range of phenotypic variation
d. all of the above
e. none of the above
Explanation / Answer
2) A
The trait has no genetic basis.
if there is no variation in the alleles, then everyone has the same genes and heritability would be zero.
3) D
QTL mapping is used to measure quantitative traits like height that are polygenic. Same as linkage mapping except the phenotype is continuous and the markers are put into a scoring scheme to measure their contribution.
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