In the fruit fly Drosophila a rudimentary wing called vestig

In the fruit fly Drosophila, a rudimentary wing called \"vestigial\" is recessive to its dominant wild-type counterpart, full wing. Monohybrid wild-type males and females are crossed, and 2700 progeny are produced.

A. How many progeny flies are expected to have vestigial wings?

B. How many progeny flies are expected to have full wings?

Solution

The cross is between monohybrid males and females. Let \'v\' be the symbol for vestigial. So, we can symbolize a monohybrid as \'+v\'

+v (wild type) are crossed to +v (wild type).

2700 progeny are produced

A.

Now, those having \'vv\' genotype will have vestigial wings. According to Mendel F2 ratio should be 3:1. So, the number of flies having vestigial wings = 1/4th of total = (2700/4) = 675.

B.

Number of flies having full wings = 3/4th of total = 675*3 = 2025