. In fruitflies, the wildtype brick red eyes are due to the accumulation of two
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Question
. In fruitflies, the wildtype brick red eyes are due to the accumulation of two pigments, the brown pigment ommochrome and the red pigment pteridine. The cinnabar locus on autosome 2 encodes an essential enzyme for the production of ommochrome. Mutations in the cinnabar locus are usually recessive and result in flies with bright red eyes. The white locus on the X chromosome encodes a membrane pump that concentrates ommochrome and pteridine in the eyes. Mutations at the white locus are recessive and result in white eyed flies. A dihybrid cross was conducted by mating true breeding cinnabar eyed males with a true breeding white eyed females. In the F1 generation, the females F1 were wildtype and the males were white eyed. What percentage (or fraction) of the male F2 flies would be wildtype?Explanation / Answer
When a dihybrid cross was conducted between true breeding cinnabar eyed male with a true breeding while eyed females it is observed that in f1 generation the progenese females were wildtype as it is a X linked inheritance hense females have two X chromosomes so they becomes the carrier and is not infected while males have only One x chromosome so they are infected. While in f2 generation it is observed that about 33.3% of the males would be wild type and the rest would be white eyed.
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