Question

Three of the many recessive mutations in Drosophila melanogaster that affect body colour, wing shape or bristle morphology are black (b) body versus grey in wild type, dumpy (dp), obliquely truncated wing versus long wing in the wild type and hooked (hk) bristles at the tip versus not hooked in the wild type. From a cross of a dumpy female with a black and hooked male, all the F1 are wild type for all three characters. The test cross of an F1 female with a dumpy, black, hooked male gave the following results:

(i) Construct a map of these genes showing gene order and distance between them. [4]

(ii) Determine the coefficient of coincidence for the portion of chromosome involved in this cross. [1]

(iii) How much interference is there? [1]





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Answer 1

Explanation:

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Answer 2

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