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Unformatted text preview: Name_____________________________ BIOLOGY 325H QUIZ 9 [5 pts] _____________________________________________________________ 1. [2 pts] In mouse, the Pax6 gene has discrete, physically separate enhancers that are responsible for expression of this gene in the pancreas, the neural tube, the cornea/lens, and the retina. Why is it that each of these enhancers only activates transcription in one organ, and not in other organs? Each enhancer is responding (by activating transcription) to a specific set of transcription factor proteins. The cells in each of these organs contain different profiles of transcription factors, and thus even though these organs all transcribe Pax6 , they activate its transcription via different enhancer sequences. 2. [2 pts] In terms of genotype, what is the difference between a hybrid and a chimera? A hybrid is the offspring produced by mating individuals of two different species or strains. Each of A hybrid is the offspring produced by mating individuals of two different species or strains....
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