Question

In fruit flies red eyes are dominat trait and white eyes are recessive what genotype ratio would we expect to see in offsprings of two heterozygous and red eye flies

Answer 1

The genotype ratio of offspring from two heterozygous red-eyed fruit flies is 1 red-eyed homozygous female (RR), 1 red-eyed heterozygous female (Rr), 1 red-eyed hemizygous male (RY), and 1 white-eyed hemizygous male (rY), giving a phenotype ratio of 3:1 with three-fourths red-eyed and one-fourth white-eyed offspring.

Step-by-step explanation:

When considering the genotype ratio of offspring from two heterozygous red-eyed fruit flies, it is important to understand that eye color in fruit flies (Drosophila melanogaster) is an X-linked trait. In this scenario, each parent has one dominant allele for red eyes (R) and one recessive allele for white eyes (r).

To determine the expected ratio of offspring genotypes, we can set up a Punnett square using the allele combinations that each parent can pass on. The female can pass on XR or Xr (since females have two X chromosomes), and the male can pass on XR or Y (since males have one X and one Y chromosome).

Therefore, the expected phenotype ratio would be 3:1, with three-fourths of the offspring having red eyes and one-fourth having white eyes. The genotype ratio for red-eyed females (homozygous and heterozygous combined) to white-eyed males is 1:1.