BIOL 121 (2011) Fall Exam 3 + Key

The relationship between genes p and n is an example

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Unformatted text preview: is composed of both RNA and proteins. 2 BIOL 121 Exam 3 12/5/2011 (4 pts) NAME: 3 BIOL 121 NAME: Exam 3 12/5/2011 4) Porcupines with the dominant allele, P, have long spines, whereas homozygous recessive pp porcupines have short spines. At a different locus, homozygous recessive nn porcupines have no spines at all. The relationship between genes P and N is an example of A. pleitropy B. codominance C. incomplete dominance D. dominance E. epistasis (4 pts) 5) Green leaves (B) are dominant to purple (b) and short plants (T) are dominant to tall plants (t). What fraction of the progeny of the cross BbTt × BBtt will have green leaves and be tall? A. 9/16 B. 1/16 C. 1/2 D. 3/16 E. 3/8 (4 pts) 6) In the process of translation, release factor A. is a specialized tRNA. B. is a protein that shares similarities in size and shape with a tRNA. C. releases RNA polymerase so that translation can initiate. D. catalyzes the removal of tRNA from f- Met. (3 pts) 7) Evolution requires ___________ of which __________ is the ultimate source. A. competition; mate choice B. natural selection; competition C. epistasis; gene flow D. genetic variation; mutation E. phenotypic variation; genetic variation (4 pts) 4 BIOL 121...
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