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Unformatted text preview: You have identified two mutants that have opposite phenotypes: The tra-1 mutant transforms XX hermaphrodites into XX males, while the her-1 mutant results in X0 hermaphrodites. To determine the relationship between these two genes, you cross a tra-1 mutant to a her-1 mutant. The F1s are phenotypically wild type. In the F2 you see 93 wild type (XX = hermaphrodite); 32 X0 hermaphrodites and 44 XX males. a. (4pts) Formulate a hypothesis to explain these results (1 sentences max!). Recessive epistasis gene interaction because of the 9:3:4 ratio in the F2. b. (6pts) Which gene is epistatic? Explain your reasoning. Because you are seeing more tra-1 mutants, the double mutants are phenotypically tra-1 indicating that tra-1 is epistatic to her-1 ....
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This note was uploaded on 07/02/2010 for the course BIS BIS 101 taught by Professor Sanders during the Spring '09 term at UC Davis.
- Spring '09