1) The rate at which genetic drift fixes and eliminates alleles depends on what
ID: 194571 • Letter: 1
Question
1) The rate at which genetic drift fixes and eliminates alleles depends on what factor(s)?
Select one:
a. population size
b. intensity of non-random mating
c. initial allele frequencies
d. both A and C
2)
During a founder event, what process can dramatically shift allele frequencies in the founder population away from the frequencies in the source population?
Select one:
a. genetic drift
b. migration and gene flow
c. negative frequency dependent selection
d. linkage
3)
The loss of heterozygosity due to genetic drift is generally bad for a population's fitness and chances for long-term survival because...
Select one:
a. selection favors homozygotes
b. selection favors heterozygotes
c. increased frequency of homozygotes exposes deleterious recessive traits
d. genetic diversity is critical for adaptation if environmental conditions change
e. both c and d
Explanation / Answer
1.
Option D is correct.
The rate at which genetic drift fixes or eliminates a particular allele depends upon the population size as well as the frequency of the allele in the founder population.
2.
Option A is correct.
Genetic drift can cause dramatic changes in allele frequencies in the founder populations.
3.
Option E is correct.
Heterozygosity is good for the genetic diversity in a population as each allele may behave differently to a changing environment.
Heterozygosity maintains genetic diversity in a population.
It also helps to preserve a population from harmful homozygous recessive traits.
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