Question

In Fruit fly, red eye colour (R) is dominant, and white eye colour (r) is recessive. A
homozygous red eyed fruit fly is crossed with a white eyed fruit fly
What kind of a progeny will be obtained in the F1 generation with respect to eye colour?

Answer 1

Explanation:

Since red eye color is dominant over green and long wings are dominant over short, the parents are homozygous for these recessive traits. The genotype of a parent with short-winged, green-eye is llrr and that of a long-winged, red-eyed fly is LlRr. The ratio of red and green-eyed progeny is 1:1 and likewise, the ratio of progeny with short and long wings is also 1:1. A cross between heterozygous dominant and homozygous recessive gives 1 dominant: 1 recessive progeny. This means the parent fly with long-wings, red-eyes is heterozygous for eye color and wing length. Therefore, the genotype of a parent with long-wings, red-eye is LlRr