In chickens, short legs dominate over normal legs. When crossing chickens, 356 chickens were obtained

In chickens, short legs dominate over normal legs. When crossing chickens, 356 chickens were obtained, of which 89 had normal legs. Determine the genotypes of the parents and offspring.

Let’s solve a genetic problem.

Given:

A – short-legged.

a – normal legs.

F1 = 356 chicks: 89 with normal legs.

Find: P, F1-?

Decision:

If the chickens with normal legs are 89, then the short-legged ones are 267.

267/89 = 3, which means the ratio of chickens = 1/3 (for 1 normal there are 3 short-legged).

A ratio of 1/3 gives us a crossing of heterozygotes.

R: ♀Aa x ♂Aa.

Gametes: A, a, A, a.

F1: AA, Aa, Aa, aa.

Answer: R: ♀Aa, ♂Aa.

F1: AA, Aa, Aa, aa.