On a chicken farm a mutation arose that gave hot wings flavo

On a chicken farm, a mutation arose that gave \"hot wings\" flavored chicken. The hot wings flavored chicken meat proved very popular in stores, but the breeders could not develop a pure-breeding strain of hot wing chickens. Every time two hot wings chickens were crossed, some normal chickens appeared in the progeny. For example, one mating between two hot wings chickens produced 6 hot winfs and 3 normal progeny. All other such matings gave similar progeny ratios. State a concise genetic hypothesis that accounts for these results, indicating the genotype of the normal and hot wings.

Solution

Ans:

Answer: The key to solving this problem is in the statement that breeders cannot develop a pure–breeding stock and that a cross of two ‘hot wings’ results in some normal progeny. Hot wings must be dominant to normal and heterozygous (A/a). Since 6:3 ratio is very close to 2:1, because a 1:2:1 ratio is expected in a heterozygous cross, one genotype is nonviable. It must be the A/A, homozygous hot wings, genotype that is nonviable, because the homozygous recessive genotype is normal color (a/a). Therefore, the hot wings allele is a pleiotropic allele that governs chicken flavour in the heterozygous state and is lethal when homozygous.