Question

If a yellow body, white-eyed Drosophila is crossed with wild brown body red eyes drosophila. Then what would be the frequency of recombinants in the F1 generation?
A 100%
B 1.3%
C 98.7%
D 0%

Answer 1

Hint: Drosophila or fruit fly because of its small life cycle and easy reproducibility is used to carry out various experiments related to genetics. They are hermaphrodite that means having both male and female organisms.

Complete answer: If a yellow body, white-eyed Drosophila Is crossed with the wild brown-red eyes Drosophila Then the frequency of three combinations in the effort direction which would be between a wild type dominant and the recessive individual in the dihybrid Cross will be hundred percent where B is brown body Of the wild type, b is the one with a yellow body, R is red eyes wild type and r is the white-eyed Drosophila which will result in the recombination BbRr. This condition is only unless the genes are not linked with each other.

Additional information: Adult Drosophila flies are active during warm, bright days and feed on the surfaces of fruits, leaves, plant secretions, and honeydew produced by aphids. During the preoviposition feeding stage, adult fruit flies spend time feeding on fruits, vegetables, and decaying materials.

Hence the correct option is A, 100%.

Note: An organism species which show genotypes which are different from the genotype of the original parents are said to have arisen via recombination or crossing over. This phenomenon occurs during the pachytene stage of the meiosis in both plants and animals.