4. (6 marks) A true-breeding Drosophila with red eyes and small body size was cr

Question

4. (6 marks) A true-breeding Drosophila with red eyes and small body size was crossed with a true-breeding Drosophila with scarlet eyes and normal body size. The F1 all had red eyes and normal body size. The F1 were crossed with Drosophila with scarlet eyes and small bodies. The progeny were as follows: red eyes and normal body size 56 red eyes and small body size 218 scarlet eyes and normal body size 182 scarlet eyes and small body size 44 Explain why you suspect these genes are on the same chromosome

Explanation / Answer

To be on the same chromosome, gene should have distance of less than 50 cM.

In this case there are total 100 recombinants which are red eyes and normal body size (56) and scarlet eyes and small body size (44).

Distance between genes = recombinant progeny / total progeny

= 100 / 500.

= 0.2

= 20 cM.

Since distance between two genes are less than 50 cM, we can conclude.that both the genes are on the same chromosome.

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