Hemophilia is an x-linked recessive trait. In a population of 2000 people, 4 women have hemophilia,...

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Hemophilia is an x-linked recessive trait. In a population of 2000 people, 4 women have hemophilia,...

Hemophilia is an x-linked recessive trait. In a population of 2000 people, 4 women have hemophilia, 30 men have hemophilia, and 80 are carriers of the disorder. What is the frequency of the hemophilia allele? (Assume the population is 50% men and 50% women.)

a.0.059

b.0.033

c.0.057

d.0.039

e.0.038

In a population of 15,000 individuals, 1350 express a recessive trait. How many heterozygotes are there expected to be?

a.2100

b.3150

c.6300

d.1800

e.4200

science biology

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Answer 1

Answer #1

Answer:

Q1). d. 0.039

Explanation:

4 hemophilic women = 8 hemophilic alleles

30 hemophilic men = 30 hemophilic alleles

80 carrieres = 80 normal alleles and 80 hemophilic alleles

Remaining individuals are normal = 2000 – 114 = 1886

943 men = 943 normal alleles

943 women = 943*2 = 1886 normal alleles

Total alleles = 3027

Total hemophilic alleles = 8+30+80 = 118

Frequency of hemophilic allele = 118/3027 = 0.039

Q2).

c. 6300

Explanation:

Recessive trait frequency = q^2 = 1350 / 15000 = 0.09

Recessive allele frequency = q = SQRT of q^2 = 0.3

Dominant allele frequency = p = 1-0.3 = 0.7

Heterozygote frequency = 2pq = 2*0.7 * 0.3 = 0.42

Number of heterozygotes = 0.42 * 15000 = 6300

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Answer 2

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