Having straight hair (S) is dominant over having curly hair (s). A heterozygous parent with straight hair is crossed with a homozygous recessive parent with curly.What is the probability that the offspring will have curly hair?

The heterozygous straight-haired parent has genotype Ss, and the curly-haired parent has genotype ss. The Ss parent can pass on S or s, while the ss parent can pass on only s. Half the offspring are expected to be ss and have curly hair, so the probability is 50% (choice B).

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