Horniness in sheep is a sex-dependent sign. In sheep, the H gene determines the development of horns, the H ‘gene

Horniness in sheep is a sex-dependent sign. In sheep, the H gene determines the development of horns, the H ‘gene – the absence of horns. Males with genotypes HH and HH ‘are horned. Having the HH genotype, females can be horned, and heterozygous females – hornless. What offspring and in what numerical ratio can be expected from crossing:
1) a horned female and a homozygous horned male;
2) male and female heterozygous for horniness gene;
3) a hornless male and a horned female?

1) From crossing a horned female and a homozygous horned male, uniform horned offspring can be expected;
2) from crossing heterozygous for the gene of horniness male and female, horned females, hornless females, horned males and horned males can be expected in a ratio of 1: 3: 3: 1;
3) from crossing a hornless male and a horned female, one can expect hornless females and horned males in a 1: 1 ratio.

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