BIOL 121 (2010) Spring Exam 3

If necessary revise your hypothesis 5 pts

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Unformatted text preview: NAME: 9) Chromatin remodeling by histone acetyltransferases A. is an example of post- transcriptional control of gene expression. B. enables RNA polymerase to access promoters. C. blocks translation. D. Is regulated by activators. (3 pts) 10) Males of the closely related frog species Hyla regilla and H. cadaverina have different mating calls to prevent hybridization (breeding across species). Having fewer potential mates is a selective disadvantage (fewer mates = less breeding success). So why has evolution favored mechanisms to prevent hybridization? A. Hybrid offspring have lower fitness B. Hybridization increases genetic variation C. The mating call of male hybrid offspring does not resemble that of either species D. To prevent random mating that can lead t...
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This note was uploaded on 01/16/2014 for the course BIOL 121 taught by Professor Dustinbrisson during the Fall '11 term at UPenn.

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