In chickens, a sex-linked lethal gene (a) is found that causes the death of embryos; heterozygotes for this gene are viable. A normal chicken was crossed with a rooster heterozygous for this gene (in birds, the heterogametic sex is female). Make a scheme for solving the problem, determine the genotypes of the parents, gender and genotype of possible offspring and the probability of hatching chickens from the total number of viable offspring.
1) parental genotype: HA Ha, HA Y,
2) the offspring genotype – ХА Y – chicken, ХА ХА, ХА ХА – males, ХА Y – non-viable chicken,
3) the probability of hatching chickens from the total number of viable offspring is 33%.
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