QUESTION 9 An animal has a gene that is expressed in the tail in the embryo and

Question

QUESTION 9 An animal has a gene that is expressed in the tail in the embryo and in the eye after birth. The gene has a tail-specific enhancer and an eye-specific enhancer nearby. What are two things that must also be present in order for this gene to achieve this specific expression pattern A transcription factor that interacts with the eye-enhancer that is present in eye cells after birth but not before birth A transcription factor that interacts with the tail-enhancer that is present tail cells after birth but not before A transcription factor that interacts with the tail-enhancer that is present in the tail cells of embryos, but not after birth A transcription factor that interacts with the eye enhancer that is present in eye cells of embryos, but not after birth QUESTION 10 What is the outcome of alternative splicing? Multiple genes from a single mRNA Multiple proteins from a single gene Multiple proteins from a single mRNA o Multiple mRNAs from a single protein

Explanation / Answer

9. Option first and third are correct. The transcription factor that interacts with the tail enhancer that is present in the tail cells of embryo but does not interact after birth because after birth the same gene interact with the transcription factor responsible for eye expression. Thus, option first and third are two correct things.

10.Option 2nd is correct. A mRNA synthesized from a gene undergoes alternative splicing to remove introns (post-transcriptional modification) and due to this alternative splicing this mRNA can arrange in many different way and thus, a large number of mRNA are possible from a single gene and hence a large number of proteins are possible from a single gene (one protein from each possible mRNA).

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