What color eyes would a fly with the genotype RR have?
The cross is between a red-eyed fruit fly and a white-eyed (rr) fruit fly. The only way an offspring can have white eyes, is if it inherited a recessive allele from both parents. The gene for eye color in fruit flies is actually sex-linked on the X-chromosome.
Can female fruit fly have white eyes?
As the females will receive the dominant red-eyed allele from the male gamete and recessive white-eyed allele from the female gamete. Therefore, the percentage of white eyes female offspring will be zero as all daughters will be red-eyed and heterozygous.
Is there any chance that any female offspring might have white eyes?
Both male and female children will inherit a normal X chromosome from the female. None of the male or female offspring will have white eyes.
What is the genotype of a white-eyed male fly?
Like humans, Drosophila males have an XY chromosome pair, and females are XX. In flies, the wild-type eye color is red (XW) and it is dominant to white eye color (Xw) (Figure 1).
What is the correct genotype for a male fly with white eyes?
Geneticists refer to the state of the male genotype (with only one X chromosome) as hemizygous. If eye color is inherited along with the X chromosome, then it can be denoted as a linked trait by tagging the X chromosome with a symbol, as follows: X+ = Red-eye trait (wild type) Xw = White-eye trait.
What are the heterozygous genotypes?
(HEH-teh-roh-ZY-gus JEE-noh-tipe) The presence of two different alleles at a particular gene locus. A heterozygous genotype may include one normal allele and one mutated allele or two different mutated alleles (compound heterozygote).