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Mutants affect different genes involved in eye development.




Let's say that during your labs you identify two mutant strains of drosophila that exhibit a no eye phenotype (eyeless). Further test show that both mutant phenotypes are recessive. You cross the two strains with each other. All the F1 offspring are phenotypically wild-type. After intercrossing these F1 flies (F1 X F1), however, you observe 562 wild-type flies and 438 eyeless flies in the F2 generation. What is the most likely explanation for these results?;Select one;a. The two mutants affect different genes involved in eye development.;b. This F2 ratio results suggests that there is some sort of variable penetrance in the wild type allele.;c. There is not enough information to explain the results.;d. The F1 cross is a test cross giving approximate 1:1 ratios of wild type to eyeless.;e. The two mutants carry alleles affecting the same gene needed for eye formation.


Paper#15114 | Written in 18-Jul-2015

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