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Question 11 [20 marks / 20 minutes] This question is about mechanisms of gene regulation in eukaryotes. a)...

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Biology

Question 11 [20 marks / 20 minutes]
This question is about mechanisms of gene regulation ineukaryotes.

a) In Drosophila melanogaster, Sex-lethal (Sxl) controlssomatic sexual development.

i. Describe the regulatory mechanism that leads to thepresence of Sxl protein only in female
early embryos. [4 marks]

ii. Explain how this difference is maintained later in thelife cycle [6 marks]

b) List two RNA modifications present in eukaryotes. Describein detail the function of one of
these RNA modifications in a living cell. [6 marks]

c) Describe the function of two different DNA and/or histonemodifications present in eukaryotes.
[4 marks]

Answer & Explanation Solved by verified expert
4.4 Ratings (642 Votes)
Describe the regulatory mechanism that leads to the presence of Sxl protein only in female early embryos Ans1 Sexlethal Sxl gene expression depends on the XA signal which is a main contributor in sex determination It is in the form of 2X2A in female and activated while in males its inactivated in the    See Answer
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