The platinum-colored trait in foxes is semi-lethal. In a homozygous state, it is lethal. The recessive gene (s) determines the silvery coloration. At the fur farm, platinum and silver foxes were crossed. Determine the probability of birth (%) of platinum foxes in the offspring. Indicate the genotype of the parents; probability of birth (%) of offspring.
1. The platinum-colored trait is semi-lethal. For this reason, purebred platinum foxes, that is, carriers of the AA genotype, cannot exist in nature. All platinum foxes have the Aa genotype, that is, they are heterozygous.
Female – Aa
2. Silver males (aa) – analyzing crossing.
3. Female Aa x male aa = F1 50% Aa – platinum and 50% aa – silver
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