A person has long eyelashes – a dominant feature. A woman with long eyelashes, whose father had short eyelashes, married a man with short eyelashes. What is the likelihood of having a baby with long eyelashes? What genotypes can children of this couple have?
A – long eyelashes, and – short eyelashes.
Since the woman had a father with short eyelashes, that is, homozygous for a recessive trait, a woman with long eyelashes has the Aa genotype (heterozygous). Her husband, like his father – aa.
Genotyping in children will be Aa: aa, 1: 1. According to the phenotype of long eyelashes: short eyelashes 1: 1.
Answer: a woman has 2 types of gametes; in men, 1 type of gametes is formed; the probability of having children with long eyelashes is 50%; among children of this married couple there can be 2 different genotypes (Aa, aa) and two different phenotypes (long eyelashes, short eyelashes).
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