The colour of feathers in Andalusian fowl is controlled by a single codominant, autosomal gene, where a blue phenotype results from both black and white alleles. What would be the phenotypic ratio in offspring if a blue feather hen was crossed with a blue feather rooster?

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BlackTom AI · Accepted Answer

In codominant inheritance for feather color, the two alleles are Black (B) and White (W), and the heterozygote BW expresses the blue phenotype.
The cross is BW (blue) × BW (blue).
- Possible gametes from each parent: B and W.
- Punnett square gives: BB (black), BW (blue), WB (blue), and WW (white).
Thus the phenotypes appear as: Black from BB, Blue from BW and WB, and White from WW.
- Proportion: 1 Black : 2 Blue : 1 White.
Evaluating the provided options, the correct description of the offspring phenotypic ratio is 1 Black: 2 Blue: 1 White.
The other choices are inconsistent with codominant inheritance:
- All Blue would ignore the presence of BB and WW genotypes.
- 3 Blue: 1 White would imply a different inheritance pattern, not codominance.
- 1 Black: 1 Blue would not account for the observable white phenotype from WW offspring.

AGRI10051_2025_SM2 Supplementary or Special Exam: Genetics for Agriculture (AGRI10051_2025_SM2)- Requires Respondus LockDown Browser

The colour of feathers in Andalusian fowl is controlled by a single codominant, autosomal gene, where a blue phenotype results from both black and white alleles. What would be the phenotypic ratio in offspring if a blue feather hen was crossed with a blue feather rooster?

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