AGB-0083
QUESTION
Roan coat colour in short horned castle is an example of which type if gene action?
OPTIONS
(A) Dominance
(B) Co-dominance
(C) Recessive
(D) None of the above
ANSWER
(B) Co-dominance
EXPLANATION
Roan coat colour in Shorthorn cattle results from the expression of both red and white alleles in the heterozygote, so it is a classic example of codominance. Dominance would mask one allele, recessive inheritance requires the recessive genotype for expression, and therefore those mechanisms do not explain the roan phenotype.
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