Andalusian chickens are one of the hundreds of different varieties of chickens.

Question

Andalusian chickens are one of the hundreds of different varieties of chickens. ( Sometime, see Feathersite.com for photographs of many more varieties of Gallus gallus.) Andalusians chickens come in 3 color varieties: black, white, and blue (so-called 'blues' are actually gray).   The Black Andalusians are known to be homozygous at this color locus. We’ll symbolize their genotype with: A1A1. The White Andalusian are known to be homozyogous at this color locus. We’ll symbolize their genotype with:   A2A2. When a Black and White are bred, all the members of their F1 are blue.

If you crossed two Blue Andalusians what would be the predicted genotypic ratio of their F1?

1:1 (50% blue: 50% black)

1:1 (50% blue: 50% white)

1:2:1 (25% white: 50% blue: 25% black)

2:1 (75% blue: 25% black)

1:1 (50% blue: 50% black)

1:1 (50% blue: 50% white)

1:2:1 (25% white: 50% blue: 25% black)

2:1 (75% blue: 25% black)

Explanation / Answer

If you crossed two Blue Andalusians what would be the predicted genotypic ratio of their F1?

1:2:1 (25% white: 50% blue: 25% black)

Andalusian chicken occurs in three colors of black, white, and blue. The crossing between the black and white Andalusian homozygous results in hybrid F1 Blue Heterozygous. The two blue Andalusians F1 crossing results in 25%of homozygous white, 50% of heterozygous blue, and 25% of homozygous black in the ratio of 1:2:1.

1:2:1 (25% white: 50% blue: 25% black)

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