32. In a species which exhibits population structure which of the following stat

Question

32.    In a species which exhibits population structure which of the following statements is not true?

         a) genetic drift will tend to cause the populations to diverge genetically b) different patterns of fitness among genotypes in different populations will cause the populations to diverge genetically c) migration among populations will cause populations to diverge genetically d) random mutations will cause populations to diverge genetically.

33.    Selection must be occurring in a population a) when there is phenotypic variation b) when allele frequencies fluctuate from generation to generation c) when different genotypes result in different phenotypes which differ in reproductive fitness d) when population size is small e) all of the above

34.    In a population genetics context, migration a) tends to cause populations of a species to diverge from each other genetically b) results in the exchange of genes between populations c) involves the movement of all of the individuals of one population to a new area that contains no individuals of the same species

         d) causes a reduction in genetic variation in a population receiving new migrants.

35.    You start with 100 independent demes of a species between which there is no migration. Each populaiton consists of 100 individuals. All of the populations start with allele frequencies of alleles A and a of 0.5. Over time you would expect a) the mean allele frequency of the 100 populations to increase toward 1 for the A allele b) the variance of allele frequencies among the 100 populations to increase over time c) that some populations would eventually go to a frequency of 1 for the A allele and some would go to a frequency of 1 for the a allele d) a & c e) b & c.   

36.    In the US sickle-cell anemia a) is under stabilizing selection b) is under directional selection c) exhibits heterozygote advantage d) does not exist.  

37. Over time, which of the following evoutionary forces will tend to reduce genetic variation in a population a) directional selection b) genetic drift c) heterozygote advantage d) a & c e) a & b.

Explanation / Answer

Ans 32:

c) migration among populations will cause populations to diverge genetically.

Migration refer to movement of individuals of a population.

Migrations affect gene frequencies but not gene sequence .

Ans 33:

c) when different genotypes result in different phenotypes which differ in reproductive fitness .

Ans 34:

b) results in the exchange of genes between populations

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