10 Jun In a lab strain of Drosophila, cinnabar – What is unexpected about these
Question
Drosophilla crosses
In a lab strain of Drosophila, cinnabar (cn) and brown (bw) are recessive eye colour mutations known to be 41 m.u. apart on chromosome 2. When similar mutant alleles were induced in a strain from nature, the same linkage of cn and bw was observed. However, when a wild-type strain from nature was crossed with a cn bw/cn bw lab strain to create the genotype + +/cn bw, and females of this type were test-crossed to cn bw/cn bw males from the lab strain, the following phenotypic proportions were observed in the progeny:
+ + 25,200
cn bw 21,009
cn + 11
+ bw 36
(a) What is unexpected about these results?
(b) What is the most likely explanation? (Draw a diagram)
(c) On the diagram show the precise origin of the cn + and the + bw classes.
Ideas are expressed.
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