. In cattle, the alleles producing coat color are co-dominant. RR individuals ar
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Question
. In cattle, the alleles producing coat color are co-dominant. RR individuals are red, WW individuals are white, and RW individuals are “roan” – meaning that their coat is red with a liberal sprinkling of white hairs. In the same animals, the allele for horn production (H) is completely dominant over the allele that codes for the lack of horns (h). Imagine that a hornless roan bull is mated with a red female who is heterozygous for the horn gene. What would be the phenotypic ratio of their offspring?
Explanation / Answer
When you made a cross between Roan hornless (RWhh) with Red horned (RRHh) it produces 1:1:1:1 phenotypic ratio of Red horned: Red hornless: Roan horned: Roan hornless.
RWhh individual produces Rh and Wh gametes.
RRHh individual produces RH and Rh gametes.
Cross Rh with RH and Rh of other individual
Rh X RH = RRHhn (red Hornes)
Rh X Rh = RRhh (red hornless)
Cross Wh with RH and Rh individual gamates produces
Wh X RH = RWHh (roan horned)
Wh X Rh = RWhh (roan hornless)
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