In shorthorn cattle, white cattle are pure-breeding and red cattle are pure-bree

Question

In shorthorn cattle, white cattle are pure-breeding and red cattle are pure-breeding. However,  a cross between a white cow and a red bull produces offspring with a color called roan. Roan cows have both red and white hairs. What is the most likely explanation for this?

A) Roan is incompletely penetrant

B) Red and white are incompletely dominant or co-dominant

C) roan is sex-influenced

D) roan has variable expressivity

E) none of the above

A) Roan is incompletely penetrant

B) Red and white are incompletely dominant or co-dominant

C) roan is sex-influenced

D) roan has variable expressivity

E) none of the above

Explanation / Answer

Ans b

Roan cattles show codominance for the colour of their hair so they inherit both colour hairs . They are heterozygous as both alleles of red and white colour are present in their genome.

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