In humans, baldness is a gender-dependent sign. The baldness gene is dominant in men, but not in women.

In humans, baldness is a gender-dependent sign. The baldness gene is dominant in men, but not in women. For baldness, a man needs only one allele of the gene. In women, baldness occurs only if there are two dominant alleles in the genotype. What offspring can be expected from a marriage:
1) a bald homozygous man and a woman with normal hair heterozygous for the baldness gene;
2) a bald heterozygous man with a woman with normal hair, whose mother was bald;
3) a bald heterozygous man and a bald woman?

1) From the marriage of a bald homozygous man and a woman with normal hair heterozygous for the gene for baldness, girls with normal hair, girls with early hair loss and boys with early hair loss in a ratio of 1: 1: 2 can be expected;
2) from the marriage of a bald heterozygous man with a woman with normal hair, whose mother was bald, one can expect girls with normal hair, girls with early hair loss, boys with normal hair and boys with early hair loss in a ratio of 3: 1: 1: 3;
3) from the marriage of a bald heterozygous man and a bald woman one can expect girls with normal hair, girls with early hair loss, boys with normal hair and boys with early hair loss in a ratio of 1: 1: 1: 1.

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