Chapter 5, Problem 31P

As part of their analysis of intragenic recombination, Melvin Green and Kathleen Green studied lozenge $\text{-}$ eyed females with the mutation ${\text{lz}}^{\text{46}}$ on one X chromosome and the mutation ${\text{lz}}^{\text{g}}$ on the homologous X chromosome. The ${\text{lz}}^{\text{g}}$ $\text{-}$ bearing X chromosome also carried recessive mutations for cut wing (ct) and vermilion $\text{-}$ colored eye (v). These females were mated to cut wing males that had vermilion $\text{-}$ colored, lozenge $\text{-}$ shaped eyes. The chromosomes of these flies are depicted in the following drawing.

Diagram the recombination event within the lz gene and draw the resulting recombinant X chromosomes, illustrating the lz alleles and the flanking markers on each chromosome.

What are the phenotypes of progeny male flies carrying lz intragenic recombinants? (A double $\text{-}$ mutant X chromosome carrying both ${\text{lz}}^{\text{g}}$ and ${\text{lz}}^{\text{46}}$ produces a compound lozenge eye that has a different appearance than either the ${\text{lz}}^{\text{g}}$ $\text{-}$ or ${\text{lz}}^{\text{46}}$ $\text{-}$ derived eye.)