Question

In fruit flies, one genotype for red eyes is written XRXR. The R stands for the dominant allele for red eyes. What does the X stand for? the recessive allele for white eyes the female chromosome the codominant allele for pink eyes the male chromosome

Answer 1

Answer:

The correct answer is : the female chromosome

Explanation:

• According to the question, it is mentioned that R is a dominant allele, responsible for the red eyes.
• RR is a genotype for Red eyes.
• A fruitfly has a diploid genotype which means each trait is represented by a pair of chromosomes.
• In the above question, the dominant red eye colour trait is represented by the pair of chromosomes RR.
• Therefore, XX must represent another trait.
• By convention, a pair of X chromosomes (XX) represent a female and a combination of X and Y chromosomes (XY) represents a male.
• Given XX genotype represent a female fruitfly chromosome.