1) In a population of racoons, the frequency of allele A is 0.9 and the frequenc
ID: 63905 • Letter: 1
Question
1) In a population of racoons, the frequency of allele A is 0.9 and the frequency of allele a is 0.1. Calculate the expected Hardy-Weinberg equilibrium genotypic frequencies. Show your work and circle your final answers.
2) 1,000 snails are sampled and found to display one of three genotypes: BB, Bb, and bb. There are 450 BB individuals, 220 Bb individuals, and 330 bb individuals
. a) What are the genotypic frequencies for each of these? Show your work and circle your final answers.
b) What are the allele frequencies in this population? Show your work and circle your final answers.
3) A mountain has a population of 100 wild goats, with the following number of individuals of each genotype: AA: 49, Aa: 42, and aa: 9.
a) Calculate the allele frequencies and the genotypic frequencies expected under Hardy-Weinberg. Show your work and circle your final answers.
b) Is the population in H-W equilibrium? Why or why not? (You do not need to analyze this statistically).
4) In a population of 1,000 fern plants, there are 480, 200, and 320 individuals with genotypes QQ, Qq, and qq, respectively.
a) Calculate the allele frequencies and the expected Hardy-Weinberg genotypic frequencies. Show your work and circle your final answers .
b) Is this population in Hardy-Weinberg equilibrium? Why or why not? (You do not need to analyze this statistically).
5) In a breed of dogs 1 pup in 900 is born albino. Albinism is due to a recessive gene at a coat pigment locus. Assume that the population is in Hardy-Weinberg equilibrium.
a) What is the frequency of albino alleles in the population? Show your work and circle your final answer.
b) What is the expected frequency of individuals with two normal alleles? Show your work and circle your final answer..
c) What is the expected frequency of individuals that are heterozygotes at this locus? Show your work and circle your final answer..
Explanation / Answer
1) In a population of racoons, the frequency of allele A is 0.9 and the frequency of allele a is 0.1. Calculate the expected Hardy-Weinberg equilibrium genotypic frequencies. Show your work and circle your final answers.
allele A (p) = 0.9
allele a (q) = 0.1
According to Hardy-Weinberg equilibrium p+q = 1
0.9 + 0.1 = 1
To calculate genotypic frequencies p2 + 2pq +q2 = 1
(0.9)2 + 2 (0.9 x 0.1) + (0.1)2 =1
0.81 + 0.18 + 0.01 = 1
Homozygous dominant genotype frequency is = 0.81x100 = 81%
Homozygous recessive genotype frequency = 0.01 x100 = 1%
Heterozygous genotype frequency = 0.18 x 100 = 18%
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