In cattle, the alleles producing coat color are co-dominant. RR individuals are

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? Draw punnett square to support your answer.

Explanation / Answer

Bull will be : hhRW

Gametes will be : hR,hW,hR,hW

Female will be:HhRR

Gametes will be : HR,HR,hR,hR

Bull

Phenotypic ratio = Horned red : Horned roan:Hornless red:Hornless roan

= 4:4:4:4

=1:1:1:1

Female hR hW hR hW HR HhRR Horned red HhRW Horned roan HhRR Horned red HhRW Horned roan HR HhRR Horned red HhRW Horned roan HhRR Horned red HhRW Horned roan hR hhRR Hornless red hhRW Hornless roan hhRR Hornless red hhRW Hornless roan hR hhRR Hornless red hhRW Hornless roan hhRR Hornless red hhRW Hornless roan

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