High School

What is the genotype of a homozygous dominant individual for a trait where red is dominant over white?

A. RR
B. rr
C. WW
D. ww
E. Red

Answer :

If red is the dominant trait, and white is the recessive trait, and white is the most common trait, this would suggest that the population has a higher frequency of the homozygous recessive genotype, ww. The correct answer will be ww.

Therefore, a homozygous dominant individual would have the genotype RR, meaning both copies of the gene are the dominant red allele. This individual would always express the red phenotype, since the red allele is dominant over the white allele.

However, if the white trait is more common in the population, it suggests that there are more individuals with the recessive genotype (either homozygous recessive or heterozygous) that express the white phenotype, even though they carry a red allele.

This is because an individual must have two copies of the recessive allele (ww) to express the white phenotype. Therefore, the correct option is ww.

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