A heterozygous roan bull would look like pink. Hence, option D is correct.
Further Explanation:
Codominance is known to be the relationship between the two versions of the gene. People get one version of a gene, known as allele, from each parent. When the alleles are not same, then dominant allele generally expresses while the effect of the other allele (recessive allele) is masked. The common example of this kind of dominance is observed in ABO blood group.
Incomplete dominance occurs when the dominant allele or form of the gene which does not fully masks the effects of recessive allele and displays the blending of both alleles in physical appearance. This is also called as partial or semi-dominance. The common example of this is observed in roses. The red color works as a dominant trait while recessive trait is white. However, the heterozygous roses are pink. This is different from codominance, which is when both alleles are expressed at one time. Hence, in the given case, heterozygous roan bull will display pink color.
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Answer Details:
Grade: High school
Subject: Biology
Chapter: Genetics
Keywords:
Roan bull, codominance, incomplete dominance, red color, dominant allele, a recessive allele, masking, blending, pink, white, ABO blood grouping, roses.