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

BIO 325 Fall 2007 - 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

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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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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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This note was uploaded on 03/20/2008 for the course BIO 325 taught by Professor Saxena during the Spring '08 term at University of Texas at Austin.

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BIO 325 Fall 2007 - 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

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