You survey a population of cotton rats at the UH Coastal Center for variation at

Question

You survey a population of cotton rats at the UH Coastal Center for variation at a SNP locus. You find 30 individuals that are A/A, 71 are A/G and 67 are G/G.

a. What is the frequency of the A allele in this population?

b. For the population in the previous question, what will the frequency of the A allele be when the population is in Hardy Weinberg equilibrium?

c. When the population in Question 1 is in Hardy Weinberg Equilibrium, what will be the frequency of heterozygous individuals?

d. Is the population in Question 1 in Hardy-Weinberg equilibrium? For your answer, also give the value of the chi-square statistic, the degrees of freedom, the p-value (use the table in your text).

e. In the current population, as described in Question 1, what would be the frequency of mating between A/A and A/G individuals?

Priority for part e, please.

Explanation / Answer

a) Population is 30+71+67=168

number of individual having A allele= 30+71=101

frequency of A allele= (101/168)*100= 60.11%

b) When population is in Hardy Weinberg equllibrium genotype frequencies in a population will remain constant from generation to generation if the allele frequencies remain constant.

c) Frequency of heterozygous populationis (71/168)*100= 42.26%

e) Mating is random – so that anindividual is equally likely to mate with any potential mate in the population, regardless of genotype or phenotype.

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