1. In a population of 150 pitcher plants, 75 are homozygous dominant for purple flowers, 60 are heterozygous, and 15 are homozygous recessive for yellow flowers.

a. What are the genotypic frequencies in this population?

p² =

2pq =

q² =

b. Determine the frequency of the dominant allele. p=

c. What is q?

d. If the population only produces enough plants in the next generation to maintain the

original population size and the population is in Hardy-Weinberg equilibrium, what will

the genotypic frequencies of the next generation be?

2. A population of wild cherry trees consists of 200 plants. The gene for hydrogen cyanide production exists in two forms, the dominant one results in the production of cyanide. 16% of the population expresses the recessive trait.

a. What is the value of p?

b. What is the value of q?

c. What are the genotypic frequencies in this population?

p² =

2pq =

q² =

3. This problem can be solved. Consider that the problem gives the number of individuals that express the dominant phenotype (all AA and Aa individuals), thus you can determine the number of individuals that express the recessive phenotype.

A population of green swordtails (a fish) consists of 150 fish. The gene for size at maturation exists in two forms, the recessive one results in maturation near one year of age. Fifty four fish in a population of 150 adult fish matured at two years of age (consistent with the dominant phenotype).

1. What is the value of p?

2. What is the value of q?

3. What are the genotypic frequencies in this population?

4. Twenty percent of the alleles in a population of spiders code for the dominant trait (hairy forelegs). The recessive allele codes for bare forelegs. In a population of 250 spiders:

1. What is p?

2. What is q?

3. How many spiders would you predict to represent each phenotype?

5. If the frequency of the dominant allele is 0.1 in a population of 300 individuals:

1. What is p?

2. What is q?

3. How many individuals would represent each genotype?