Tightly curled hair is caused by a dominant autosomal gene in humans.If a heterozygous curly- haired person marries a person with straight hair,what phenotypes and in what proportions are expected in the offspring?

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In this case, the heterozygous curly-haired person has one dominant allele for curly hair and one recessive allele for straight hair. The person with straight hair has two recessive alleles for straight hair. When these two individuals have offspring, there is a 50% chance that the offspring will inherit the dominant allele for curly hair and a 50% chance that the offspring will inherit the recessive allele for straight hair. Therefore, the expected ratio of phenotypes in the offspring is 1 curly-haired child for every 1 straight-haired child, or a 1:1 ratio.

Tightly Curled Hair Is Caused by a Dominant Autosomal Gene