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 _________

0.6 0.4 36% 48% 16% 84%

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 __________

0.4 0.6 36% 48% 16% 64%

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? ____________

0.5 25% 50% 2500 50

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 _______

0.8 0.2 64% 32% 4%

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 _______

0.56 0.44 31.36% 49.28% 19.36%

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 = _______

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.

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