Recessive Mutations in the Sxl Gene in Drosophila Are Lethal

question 29

Multiple Choice

Recessive mutations in the sxl gene in Drosophila are lethal in XX females because

• A) sxl functions as a repressor of male-specific dosage-compensation genes.
• B) recessive mutations indicate an increase in sxl activity.
• C) these mutations are the result of a loss of both X chromosomes.
• D) sxl is required for transcription of male-specific genes.
• E) recessive mutations are always lethal.

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