Population Genetics - Introduction to Genetic Analysis

Suppose that you are a genetic counselor,and a couple seeks your advice about BHT tasting (people who can taste BHT in processed food are recessive homozygotes for the "taster" allele and nontasters are homozygous dominant or heterozygous for the "nontaster" allele).Both prospective parents are nontasters,but a careful analysis of the husband's pedigree reveals that he is a carrier of the taster allele.The two alleles are in Hardy-Weinberg equilibrium,and the proportion of BHT tasters in the population is 16 percent.What is the probability that the couple's first child will be a nontaster of BHT?

A)0.0
B)0.32
C)0.81
D)0.86
E)1.0

Answer

Question 2

(Multiple Choice)

Free

Suppose that a population of 100 black-footed ferrets has an initial heterozygosity (H)of 0.5.How many generations will it take for this population to decline to a heterozygosity of 0.25?

A)1
B)34
C)68
D)100
E)138

Answer

Question 3

(Multiple Choice)

Free

Given below are the genotypic frequencies for a single gene with two alleles for three different populations.

\begin{array}{llll} &\underline{A A} & \underline{A a}& \underline{a a}\\\text { Population 1 } & 0.25 & 0.50 & 0.25 \\\text { Population 2 } & 0.35 & 0.56 & 0.09 \\\text { Population 3 } & 0.49 & 0.42 & 0.09\end{array}

Which of the following is/are NOT correct about these three populations?

A)One must assume Hardy-Weinberg equilibrium to calculate the allele frequencies.
B)Only two of the populations are in Hardy-Weinberg equilibrium.
C)Population 1 is in Hardy-Weinberg equilibrium;the frequency of allele A is 0.5.
D)Population 2 is not in Hardy-Weinberg equilibrium;the frequency of allele a is 0.37.
E)Population 3 is in Hardy-Weinberg equilibrium;the frequency of allele a is 0.3.

Answer