In Drosophila, Dichaete (D) is a mutation on chromosome III with a dominant effect on wing shape. It is lethal when homozygous. The genes ebony body (e) and pink eye (p) are recessive mutations on chromosome III. Flies from a Dichaete stock were crossed to homozygous ebony, pink flies, and the F1 progeny, with a Dichaete phenotype, were backcrossed to the ebony, pink homozygotes. Using the results of this backcross shown in the table,
(a) Diagram this cross, showing the genotypes of the parents and offspring of both crosses.
(b) What is the sequence and interlocus distance between these three genes?
Phenotype | Number |
Dichaete | 401 |
ebony, pink | 389 |
Dichaete, ebony | 84 |
pink | 96 |
Dichaete, pink | 2 |
ebony | 3 |
Dichaete, ebony, pink | 12 |
wild type | 13 |
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