1) In Drosophila , curledwings ( cu ) and ebony body ( e ) are recessivetraits t

Question

1)      In Drosophila, curledwings (cu) and ebony body (e) are recessivetraits that are produced by two genes that are 16 cM apart onchromosome 3. A female fly that is heterozygous for both genes(cu+cu e+e) is crossed with amale fly that is homozygous recessive for both genes (cucu e e). Determine the proportion of offspring withcurled wings and ebony bodies expected in each of the followingcases.

a.       The female fly is incoupling (cis) linkage phase.

b.      The female fly is in repulsion(trans) linkage phase.

Explanation / Answer

               cu+ cu e+e                             X               cucu e e

                                                       cu+ cu e+e      ----F1

                    cu+ cu   e+ e                             X               cu cu e e

cu+ cu  e+ e     -   4

cu+ cu  e e   - ----         1

cu cu  e+ e    -------------1

cu cu e e --------4

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