Why is the number of X chromosomes crucial for sex determination in Drosophila?
A) The Sxl promoter is responsive to the concentration of four transcription factors produced from genes on the X chromosomes.
B) The Sxl promoter is responsive to the concentration of four transcription factors produced from genes on the Y chromosome.
C) The X chromosome produces a single transcription factor that results in a male if at a low concentration and a female in a high concentration.
D) The Sxl promoter is repressed by increased concentrations of transcription factors that are produced from genes on the X chromosome.
Correct Answer:
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Q18: What describes a situation in which an
Q19: What is a trans-acting factor that increases
Q20: A trans-acting factor functions by
A)binding to enhancers
Q21: Interactions between an enhancer and a repressor
Q22: How can one primary mRNA result in
Q24: Insulators act to
A)interfere with the association between
Q25: What is the relationship between methylation and
Q26: The enhancer shown in the diagram is
Q27: Recessive mutations in the Sxl gene in
Q28: The action of which small RNA inhibits
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