Question

Tightly curled hair is caused by a dominant gene in humans. If a heterozygous curly-haired person marries a person with straight hair; what fraction of their offspring would be expected to have straight hair?

A) ½ straight
B) ¼ curly
C) 100% straight
D) ¾ curly
E) None

Answer 1

If a heterozygous curly-haired person marries a person with straight hair, their offspring would have a 50% chance of having straight hair and a 50% chance of having curly hair. Hence the correct answer is option E

Step-by-step explanation:

The trait for tightly curled hair is caused by a dominant gene in humans. If a heterozygous curly-haired person (Cc) marries a person with straight hair (cc), their offspring would have a 50% chance of having straight hair and a 50% chance of having curly hair. This is because the heterozygous individual can pass on either the dominant curly hair allele or the recessive straight hair allele to their offspring.

Hence the correct answer is option E