In some breeds of sheep the presence of horns is expressed f

In some breeds of sheep, the presence of horns is expressed from the H^h allele at an autosomal gene. This allele is dominant in rams and recessive in ewes over the H^P allele. If a female with horns is mated with a male without horns, what will be the genotype of the lambs and what will they look like when they grow up?

Solution

Female lamb with horns is mated with male lamb without horns. The horns are encoded by a dominant allele H^h on autosome. The hornless allele is H^p. The cross between horned female and hornless male results in horned lamb. This is becauseall the offspring produced will have the heterozygous genotype H^h H^p. Since, H^h is dominant allele, the individual with hetyerozygous genotype expresses horns. The lambs look with horns when they are grown up. Figure 1 is correct.

H^h H^h X H^p H^p

male / female	Hp	Hp
Hh	Hh Hp	Hh Hp
Hh	Hh Hp	Hh Hp