My work might be wrong, can you please explain the right answer? Question 3. You

Question

My work might be wrong, can you please explain the right answer? Question 3. You are studying two autosomal traits in Drosophila. You know that green eyes (G) are dominant to blue eyes (g), and that clear wings (F) are dominant to opaque wings (f). You suspect that these genes are located on the same chromosome, but you want to set up an experiment to test whether this is the case. You have access to true breeding flies with green eyes and opaque wings, true breeding flies with blue eyes and clear wings, and true breeding flies with blue eyes and opaque wings. (10 points) The boxes below represent sex cells before undergoing meiosis. Fill out the sex cells with the appropriate parental and progeny genotypes that you would use to set up your experiment. Be sure to draw the alleles on chromosomes a. Parent 1 G F Progeny 9 61 fr ff Parent 2 Test cross

Explanation / Answer

The work done for this question is correct.

True breeding parents (GGff X ggFF) which give us a heterozygous progeny (GgFf) can be used to check whether or not the genes are linked. After doing the test cross (ggff) with a homozygous recessive parent, we check the frequency of all the possible outcomes (phenotypes) and calculate the recombination frequency. (considering the cross over event which gives some unexpected results (recombinants))

If we see that we get the phenotypes similar to the parents 1 and 2 with very little recombinants (unpredicted characteristics) we can say that the genes are linked.

We say that for a recombination frequency of <50%, the genes are linked.

Recombination frequency = (Recombinants/ Total progeny)

All the Best :)

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