BIO 325 - Fall 2007 - TTh 2 to 330 - II Exam key only

BIO 325 - Fall 2007 - TTh 2 to 330 - II Exam key only -...

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mal + GENETICS (BIO 325) Fall 2007 T, Th 2:00 – 3:30 PM Key - II Exam __________________________________________________________________________________ 1. Dominance occurs between alleles of the same gene. Only one gene locus is involved in dominance. Epistasis involves two or more genes. The alleles at one locus affect the expression of alleles at another locus. 2. (a) 1: 1: 2 A/a; B/b : A/a; b/b : a/a; B/b and a/a; b/b (b) 1: 3 A/a; B/b : A/a; b/b, a/a; B/b, and a/a; b/b (c) 3:1 A/a; B/b, A/a; b/b, and a/a; B/b : a/a; b/b (d) 2: 1: 1 A/a; B/b and A/a; b/b : a/a; B/b : a/a; b/b (e) 3: 1 A/a; B/b, A/a; b/b, and a/a; b/b : a/a; B/b 3. (a) 4 3 1 2 5 D B A C E (b) 1 and 2 B 2 and 3 D 4. (a) 13 white: 3 colored (b) C/- ; I/- 9 white C/- ; i/i 3 colored c/c ; I/- 3 white c/c ; i/i 1 white 5. The trait exhibits incomplete penetrance. 6. 12 gray, 3 black, 1 brown 7. Recessive epistasis 8. (a) True (b) True (c) True (d) False (e) False 9. xyl +
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10 str s ser + 10. The linear chromosome of phage λ circularizes after entry into the host cell and is integrated into the circular E. coli chromosome at a specific site by a single cross-over. The resulting cell
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