Explore BrainMass

Explore BrainMass

    Grandchildless Recessive Drosophila

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    1. You have isolated a recessive Drosophila mutant that you call grandchildless (gls) because it behaves in the following way:

    Cross: gls/gls female x +/+ male
    F1: All sterile

    If you perform the reciprocal cross, however, you find that the result is different from that in cross 1:

    Cross: gls/gls male x +/+ female
    F1: All fertile
    F2 (from crossing F1 males and females): All fertile
    F3 (from crossing F2 males and females): ¼ sterile, ¾ fertile

    a. Explain the grandchildless mutant. If the fertile F3 are mated, what will the ratio of fertile:sterile be in the F4?
    b. You isolate a new allele of the gls gene (gls*) which behaves in the following way:
    Cross: gls/gls female x gls*/+ male
    F1: ½ fertile, ½ sterile
    Propose an explanation for the new allele of gls.

    © BrainMass Inc. brainmass.com October 9, 2019, 5:53 pm ad1c9bdddf


    Solution Summary

    An isolated drosophila mutant alleles are determined. The expert performs the reciprocal cross results.