Population Genetics Quiz

PLSC 631 - Intermediate Genetics

Populaton Genetics Quiz

1. Compare the forces that can change gene frequencies in a population.

2. The RFLP marker system was found to be useful for lemur populations. The two alleles at a single genetic locus were a 7.5 kb band (allele=A1) and 5.0 kb band (allele=A2). Blood samples were collected from 250 lemurs in a local population. Ten individuals were type A1A1, and 80 individuals were type A1A2. What are the allelic frequencies of A1 and A2 in this population?

3. Below are ten populations and the proportion of each genotype in eachpopulation. (5 pt)

Population AA Aa aa

1
1.0 0.0 0.0

2
0.0 0.5 0.0

3
0.0 1.0 0.0

4
0.5 0.25 0.25

5
0.25 0.25 0.5

6
0.25 0.5 0.25

7
0.33 0.33 0.33

8
0.04 0.32 0.64

9
0.64 0.32 0.4

10
0.986049 0.0132902 0.000049

Population	AA	Aa	aa
1	1.0	0.0	0.0
2	0.0	0.5	0.0
3	0.0	1.0	0.0
4	0.5	0.25	0.25
5	0.25	0.25	0.5
6	0.25	0.5	0.25
7	0.33	0.33	0.33
8	0.04	0.32	0.64
9	0.64	0.32	0.4
10	0.986049	0.0132902	0.000049

a. Which populations are in Hardy-Weinberg equilibrium?

b. What are the allelic frequencies for the A and a alleles in each population.

4. Plants with the genotype SS and Ss yield 500 seeds per plant in a specific population. ss individuals yield 350 seeds per plant. If the frequency of the s allele is 0.9, what is the mean number of seeds produced per plant in this population.