Question

2. A female Drosophila of unknown genotype was crossed with a white-eyed male fly, of genotype (w = white eye allele is x-linked recessive, W+= red-eye allele is dominant.) Half of the male and half of the female offspring were red-eyed, and half of the male and half of the female offspring were white-eyed. What was the genotype of the female fly?

please include work, show punnets squares and legends. thanks

Answer 1

Traits that are determined by alleles carried on the X chromosome are referred to as X-linked.

X-linked alleles require a specific notation: W^c or W⁺ where the “+” represents the dominant allele and the lowercase letter the recessive allele.

Females will have two X-linked alleles (because females are WW), whereas males will only have one X-linked allele (because males are WY).

Let (W^c) represent the recessive allele that causes white eye colour and (W⁺) represent the red eye is dominant allele. Females that are W⁺W⁺ or W⁺W^c have red eye color vision, while W^cW^c females are white eye colour. Males that are W⁺Y have red eyecolor vision, while W^cY males are white eye colour.

Reciprocal Carasses in x linted inheritanie Female as red eye and Male as white one The F, generation : all females while eyed and - all males ored eyed Sa Pa generation : % females red eyes , k jemals vstila eye, la males and oyes , la males white eye. wt w CUY. cred I elle ele euku se read as hite age wy. WW+ - wt Eye red / by red ww Scanned with CamScanner white eye white eye