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Homework answers / question archive / 1)In a sample of 1100 Japanese from Tokyo, it was found that 356, 519, and 225 individuals had blood groups M, MN, and N respectively

1)In a sample of 1100 Japanese from Tokyo, it was found that 356, 519, and 225 individuals had blood groups M, MN, and N respectively. Calculate the allele frequencies and the expected Hardy-Weinberg genotypic frequencies. Use the Chi-square test to determine whether the expected and observed numbers are in statistical agreement.

2. Assume that, in a population of birds, two alleles exist for tail color: red, which is recessive, and blue, which is dominant. Out of a total population of 1000 birds, 640 have red tails, and 360 have blue tails. Assuming the gene for tail color in this population is in Hardy-Weinberg equilibrium answer the following:

- What is the frequency of the red allele?
- What is the frequency of the blue allele?
- What percentage of the birds are heterozygous?
- What percentage of the birds are blue homozygous?

- The frequency of red-green color blindness in men in a certain population is 0.08. This form of color blindness is caused by an X-linked recessive allele. What are the Hardy-Weinberg equilibrium expected frequencies of the three genotypes among women in this population?

- For a locus in Hardy-Weinberg equilibrium where p = 0.7, what is the expected frequency of the heterozygous genotype four generations later?

5. What type of natural selection is operating on these populations with the following relative fitness of each genotype: Plug the relative fitness values into AlleleA1 to help you answer this question.

AA Aa aa

a) 0.98, 1.00, 0.96 –

b) 0.45, 0.84, 1.00 –

c) 0.95, 0.80, 0.95 –

d) 0.90, 0.80, 0.70 –

6. Consider the following population of really cool stream-dwelling salamanders:

A1A1 A1A2 A2A2

Relative frequencies 0.60 0.30 0.10

Probability of survival 0.60 0.80 0.40

Number of offspring 15.0 5.0 10.0

- Calculate the relative fitness of each genotype.

- Calculate the selection coefficient for each genotype.

- If the strength and direction of natural selection in this population remain the same, what will the frequency of the A1 and A2 alleles be when the population reaches Hardy-Weinberg equilibrium (just explain in words, you do not need math)?

- Calculate D
*p*for A1 assuming that the strength and direction of natural selection remain unchanged.

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