Population Genetics Quiz

PLSC 631 - Intermediate Genetics

Populaton Genetics Quiz

1. What are the differences between speciation via anagenesis and cladogenesis?

2. A RFLP marker system was designed to look at wild horseshoe crab populations. Two alleles at a single genetic locus were recognized: one allele, A1, corresponds to a 3.0 kb band, and the second allele, A2, corresponds to a 2.5 kb band. A population 400 crabs was found to consist of 125 individuals with A2A2 genotype. 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. 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.