Tightly curled hair is caused by a dominant autosomal gene in humans. This trait is rare among northern Europeans. If a curly-haired northern European marries a person with straight hair, what phenotypes (and in what proportions) are expected in the offspring?

a. 1/2 curly (because the curly-haired individgal is most likely heterozygous) 1/2 straight hair

b. 1/2 curly (because the curly-haired individual is most likely homozygous), 1 / 2 straight hair

c. all curly (because the curly-haired individual is most likely heterozygous)

d. 3/4 curly (because the curly-haired individual is most likely heterozygous), 1/4 straight hair

Question

Biology

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7 December, 20:53

Tightly curled hair is caused by a dominant autosomal gene in humans. This trait is rare among northern Europeans. If a curly-haired northern European marries a person with straight hair, what phenotypes (and in what proportions) are expected in the offspring?

a. 1/2 curly (because the curly-haired individgal is most likely heterozygous) 1/2 straight hair

b. 1/2 curly (because the curly-haired individual is most likely homozygous), 1 / 2 straight hair

c. all curly (because the curly-haired individual is most likely heterozygous)

d. 3/4 curly (because the curly-haired individual is most likely heterozygous), 1/4 straight hair

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Answers (1)

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Blaze Page · Answer 1

Option A: 1/2 curly (because the curly-haired individual is most likely heterozygous) 1/2 straight hair

Explanation:

Tightly curled hair is caused by a dominant autosomal gene in humans, ca either be homozygous or heterozygous dominant.

A curly haired individual that is heterozygote crossed with a person with straight hair will produce 1/2 curly and 1/2 straight

Cc (curly heterozygote) x cc (straight)

50%Cc and 50%cc

1/2 curly and 1/2 straight