Question

In Andalusian fowls (Gallus gallus), black plumage (feathers) (P) is incompletely dominant to white (PW) and the heterozygous condition results in blue plumage. a. What phenotypes, and in what ratios, will result if you breed a blue Andalusian with a

i. black bird
ii. blue bird
ill. white bird
b. Is it possible to produce a flock of blue birds that will produce only blue offspring when mated with each other? Why or why not?

Answer 1

i. Genotype - PP, PPW, PP, PPW

Phenotype - Blue Andalusian : black bird is 1:1

ii. Genotype - PP, PPW, PPW, PWPW

Phenotype - Black bird : Blue Andalusian : White bird - 1: 2: 1

iii. Genotype - PPW, PPW, PWPW, PWPW

Phenotye

Blue Andalusian : white bird

2: 2

1: 1

Step-by-step explanation:

Given -

Black plumage (feathers) (P) is incompletely dominant to white (PW)

The heterozygous condition i.e PPW gives blue color to the feather.

i. Breeding a blue Andalusian with a black bird

Genotype of blue Andalusian - PPW

Genotype of black bird - PP

PPW * PP

PP, PPW, PP, PPW

Out of 4 two are blue Andalusian and two are black bird

Blue Andalusian : black bird is 1:1

ii. Breeding a blue Andalusian with a blue Andalusian

Genotype of blue Andalusian - PPW

PPW * PPW

PP, PPW, PPW, PWPW

Phenotype

Black bird - PP - 1

Blue Andalusian (PPW) - 2

White bird (PWPW) - 1

Black bird : Blue Andalusian : White bird - 1: 2: 1

iii. Breeding a blue Andalusian with a White bird

Genotype of blue Andalusian - PPW

Genotype of white bird - PWPW

PPW * PWPW

PPW, PPW, PWPW, PWPW

Two are Blue Andalusian and two are white bird

Blue Andalusian : white bird

2: 2

1: 1