A truebreeding black goose is crossed with a white goose pro

A true-breeding black goose is crossed with a white goose, producing F1 offspring that are all gray. The F1s are intercrossed, producing F2s with the following phenotypes: 48 gray, 28 white, and 18 black. Other research has revealed that feather color in this population of geese is controlled by two genes. What type of epistasis best fits this phenotypic ratio?

Solution

for this combination Recessive epistasis (9:3:4): would best suit. Complete dominance at both gene pairs, but one gene, when homozygous recessive, is epistatic to the other.

Let s for example In Mouse coat colour.

Gene pair D: colour dominant over albino.

Gene pair ‘E’ agouti colour dominant over black.

Interaction: homozygous albino is epistatic to aguoti and black.

Agouti 9/16

Black 3/16

Albino 4/16