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?单项选择题

A

1 Black: 2 Blue: 1 White

B

All Blue

C

3 Blue: 1 White

D

1 Black: 1 Blue

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