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]

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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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