Question

q 15. in fruit flies, red eyes are dominant over brown eyes. a male with red eyes is crossed with a female with brown eyes. half of their offspring have brown eyes and half have red eyes. what does this indicate about the flies that were crossed? qa qb qc qd both parents are homozygous for the trait. the male is homozygous dominant and the female is heterozygous for the trait. both parents are heterozygous for the trait. the male is heterozygous and the female is homozygous recessive for the trait. clear all

Explanation:

Step1: Determine the genotypes

Let \(R\) represent the dominant allele (red eyes) and \(r\) represent the recessive allele (brown eyes). The female has brown eyes, so her genotype is \(rr\).

Step2: Analyze the offspring ratio

Half of the offspring have red eyes (\(Rr\)) and half have brown eyes (\(rr\)). Using the Punnett square principle (\(Rr\times rr\)), we can see that the male must have the genotype \(Rr\) (heterozygous).

Answer:

The male is heterozygous for the trait.