Population Genetics Quiz

PLSC 631 - Intermediate Genetics

Populaton Genetics Quiz

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

2. RFLP mapping at a specific locus in cattle demonstrated that two alleles were present. One allele (A1) represents a 2.5 kb band and the second allele (A2) represents a 4.0 kb band. A herd of cattle was screened, and 384 were scored as genotype A1A1, 210 were genotype A1A2 and 260 were A2A2. What are the allelic frequencies of A1 and A2 in this herd?

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. The weight of a seed for plant species in a populaton is 40 mg for WW, 30 mg for Ww and 20 mg for ww. If the frequence of the W allele is 0.3, what is the mean seed weight for the population.