A fruitfly lacks both transformer ( tra ) and transformer-2 ( tra-2 ) gene funct

Question

A fruitfly lacks both transformer (tra) and transformer-2 (tra-2) gene function. Which of the following will not occur?

a. If the fly is XY, it will develop as a male. b. If the fly is XX, the doublesex (dsx) RNA will undergo male-specific splicing. c. If the fly is XX, the Sex-lethal (Sxl) RNA will undergo male-specific splicing. d. If the fly is XX, the Sex-lethal (Sxl) gene will produce a functional protein. e. If the fly is XY, the Sex-lethal (Sxl) gene will be transcribed from only the Pm promoter.

Explanation / Answer

Ans: These genes (tra, tra-2 and sxl) are have roles in sex determination. if the fly is XX, Lack of tra (transformer) and tra-2 (transformer-2) gene would result in the Sex-lethal (Sxl) RNA to undergo male-specific splicing. So, the option C is correct.

Note: They have no effect on XY males.

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