Homework Answers
Female development in the fly depends on the Sxl protein to regulate the expression of the Tra protein and synthesis of a truncated Dsx protein which represses male genes.
So, the correct answer is the first option: Sxl, Tra
In females, Sxl proteins are functional and they bind to tra RNA and cause female specific alternative splicing. The result is production of a functional Tra protein that acts to produce female specific spliced form of Dsx transcript. This particular female form of Dsx protein turns off genes that encode proteins for development of male features.
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