Andalusian chickens can be black (BB), white (WW), or blue (BW).  Cross a black chicken with a white chicken.  What are the genotype and phenotype percentages? 

A cross between a true-breeding, white-feathered Andalusian hen and a true-breeding, black-feathered Andalusian rooster results in 100% blue-feathered Andalusian offspring.

Explanation:

the difference between incomplete dominance and codominance: ... In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as ... 50% of the offspring have genotype BW, 25% are BB, and 25% are WW.

in situ hybridization has been widely used for research applications, including clinical cytogenetics, gene mapping, tumor biology and studies of chromosome evolution.

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explanation: