Coarse hair in humans and the presence of freckles are dominant features, soft hair and lack of freckles are recessive. A heterozygous woman with soft hair and freckles marries a man with coarse hair and no freckles. What kind of children can you expect from this marriage?
Let’s designate the dominant and recessive alleles of the genes: A – hard hair, a – soft hair, B – the presence of freckles, b – the absence of freckles.
a) If the genotype of the father is AAbb, then the children will have coarse hair, but 1/2 children with freckles and 1/2 without freckles;
b) if the father’s genotype is Aabb, then children with coarse hair and freckles, coarse hair and no freckles, with soft hair and freckles, soft hair and no freckles in a ratio of 1: 1: 1: 1.
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