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In **co-dominance** (e.g. coat colour in cattle), the F₁ of a red × white cross is:
ARed
BWhite
CRoan (red AND white hair together)
DPink
Answer & Solution
Correct answer: C. Roan (red AND white hair together)
Co-dominance: both alleles are expressed equally. RR × WW gives F₁ RW = **roan** — coat has a mixture of red and white hairs (not blended pink). F₂ ratio is 1 red : 2 roan : 1 white. ABO blood groups (IA, IB co-dominant) are another classic example.
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