BIO 325 - Fall 2007 - TTh 11 to 1230 - II Exam key only

BIO 325 - Fall 2007 - TTh 11 to 1230 - II Exam key only -...

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GENETICS (BIO 325) Fall 2007 T, Th 11:00 – 12:30 PM Key - II Exam __________________________________________________________________________________________________ 1. (a) Epistasis (v) (b) Incomplete dominance (iv) (c) Co-dominance (ii) (d) Pleiotropy (i) (e) Haplosufficient (iii) 2. (c) 3. (a) Dominant epistatsis (12:3:1) (b) 9 A/-; B/- White 3 A/-; b/b White 3 a/a; B/- Yellow 1 a/a; b/b Spotted (in this case, A is the epistatic gene) 4. (a) Recessive epistasis (b) 1 (red): 1 (pink): 2 (white) 5. (a) We would expect to see a 1:2:1 monohybrid ratio. (b) The results make sense if you assume that the yellow allele is lethal when homozygous. The actual progeny would not include the homozygous recessive genotype as those progeny would die. 6. (a) The percentage of individuals with a particular genotype that exhibit the corresponding phenotype to any degree represents the penetrance of the trait. For example, an individual with a given genotype may not express the corresponding phenotype because of gene interactions or because of the effect of the environment.
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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.

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BIO 325 - Fall 2007 - TTh 11 to 1230 - II Exam key only -...

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