Question

In poultry (ZW and ZZ), the S gene controls the color of feathers and the K gene controls how fast the feathers grow. For feather color, silver is dominant to gold. For feather growth, fast feathering is dominant to slow feathering. The S and K genes are located on the Z chromosome and are 12 cM apart. You cross true-breeding silver MALES with slow feathering to gold FEMALES with fast feathering and generate F1 progeny. After intercrossing the F1s, you generate 200 F2 progeny.

How many F2 progeny do you expect for each of the following phenotypes and sexes?

For both of the problems below, show all calculations, including the genotypes and/or phenotypes needed for the calculations.

1. Silver MALES with fast feathering

2. Gold FEMALES with fast feathering

Answer 1