- In Drosophila, the brown mutation (bw, chromosome 2, position 104.5) results in brown eyes, while miniature (min, chromosome X, position 36.1) results in wings that are 2/3 the length of wild type. True breeding, wild type females are mated with true breeding males with brown eyes and miniature wings.
Using Drosophila notation, diagram the P1 and F1 crosses.
P1 F1
Fill in the chart with phenotypic ratios that would be expected in the F2 generation. Use the space provided to show your work.
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=1 =1 =1
The pigmentation of the eyes of Drosophila melanogaster is due to the synthesis and deposition in the pigment cells of red pigments [drosopterins], which are synthesized from guanine and brown pigments [omochromes] which are synthesized from tryptophan. It has been proposed that the pigment precursors are transported into the pigment cells by membrane transporters belonging to the ABC transporters and encoded by the white [w], scarlet [st], and brown [bw] genes of Drosophila melanogaster.
Mating of Drosophila melanogaster is a stereotypically patterned behavior consisting of a mixed sequence that is primarily under genetic control. Mutation that disrupts specific aspects of mating activities offer a starting point for exploring the molecular machineries underlying sexual behavior.
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