A dark-haired, big-eyed woman (dominant signs), heterozygous for both characteristics, married a fair-haired

| February 22, 2021 | education

A dark-haired, big-eyed woman (dominant signs), heterozygous for both characteristics, married a fair-haired, big-eyed male whose mother had small eyes. What are the possible genotypes and phenotypes of the children of this marriage?

Let’s designate dark hair as “A”, big eyes as “B”, blonde hair as “a” and small eyes as “b”. Then, based on the conditions of the assignments, the woman will have the AaBb genotype (since she is heterozygous), and the man aaBb (since the man’s mother had small eyes, he will be heterozygous for this trait). Let’s write down the possible types of gametes. In a woman, it is AB Ab aB ab. The man has aB and ab. Possible genotypes and phenotypes of children from this marriage: AaBB (dark hair and big eyes), AaBb (dark hair and big eyes), Aabb (dark hair and small eyes), aaBB (blonde hair and big eyes), aaBb (blonde hair and big eyes), aabb (blonde hair and small eyes).



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