1. Hardy Weinberg Problems
In a population of 100 pea plants, 16 show the recessive trait of green seeds. Tell the following:
The frequency of Y ________
The frequency of y ________
% of population that is homozygous dominant _______
% of population that is heterozygous _______
% of population that is homozygous recessive _______
% of population with yellow seeds _________

2. 0.6
0.4
36%
48%
16%
84%

3. In a population of 100,000 people, 36,000 cannot roll their tongue, a recessive trait.
Tell the following:
The frequency of R ________
The frequency of r ________
% of population that is homozygous dominant _______
% of population that is heterozygous _______
% of population that is homozygous recessive _______
% population can roll tongue _________
% population cannot roll tongue __________

5. 0.4
0.6
36%
48%
16%
64%

6. If the frequency of the dominant allele is 0.5, answer the following:
What is the frequency of the recessive allele? __________
What is the percentage of individuals with the homozygous dominant genotype? _______
What is the percentage of individuals with the heterozygous genotype?________
In a population of 5000, how many are heterozygous?
In a population of 200, how many are homozygous recessive? ____________

7. 0.5
25%
50%
2500 50

8. In snails, shell color can be dark, medium, or light
In snails, shell color can be dark, medium, or light. In a population of 300 snails, 192 have dark shells.
The frequency of S ________
The frequency of s ________
% of population that is homozygous dominant _______
% of population that is heterozygous _______
% of population that is homozygous recessive _______

9. 0.8
0.2
64%
32% 4%

10. In a population of 500,000 rabbits, 405,000 show the dominant phenotype of a bent ear. Determine the following:
a. The frequency of E ________
b. The frequency of e ________
c. % of population that is homozygous dominant _______
% of population that is heterozygous _______
% of population that is homozygous recessive _______

11. 0.56
0.44
31.36%
49.28%
19.36%

12. Suppose that one gene locus determines stripe patterns ins skunks
Suppose that one gene locus determines stripe patterns ins skunks. SS skunks have two broad stripes; Ss skunks
have two narrow stripes; ss skunks have
white speckles down their backs. A sampling of a population of skunks
found 65 broad-striped skunks;
14 narrow-striped, and 1 speckled. Determine the allele frequencies.
S = _______ s = _______

13. In a population of 200 mice, 98 are homozygous dominant for brown coat color (BB), 84 are heterozygous,
and 18 are homozygous recessive.
a. The allele frequency for B = ______
b. The allele frequency for b = ______
c. The genotype frequencies for this population are _____ BB, _______ Bb, and ______bb.

14. p = .7
q = .3
49% BB
42% Bb
9% bb