e1_examples_key - Please print First name: (Do NOT write...

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Page 1 of 6 P l e a s e p r i n t F i r s t n a m e : Last name: (Do NOT write any part of your SSN) B I O 3 2 5 E x a m 1 ± 100 points, 60 points short answer, 40 points multiple choice ± For short answer questions (1-8), write your answers in ink in the space below each question. Points per question are indicated. Partial credit will be given where appropriate. ± Multiple choice questions (9-18) are worth 4 points each. For these, pick the single best answer from the options and mark it on the Scantron in pencil . Only the Scantron answer will count and there is no partial credit. ± Use the blank sides for scratch paper. Return this exam and the Scantron at the end. 1. (6 points) Consider the following cross: A / a ; B / b ; C / c ; D / d ; E / e x a / a ; B / b ; C / C ; d / d ; E / E If there is complete dominance for each of these genes (uppercase is dominant), a) what proportion of the offspring will show the dominant phenotype for each gene? (3 points) ½ x ¾ x 1 x ½ x 1 = 3/16 b) What proportion of the offspring will be heterozygous at each locus? (3 points) ½ x ½ x ½ x ½ x ½ = 1/32 2. (9 points) A couple have a son who needs a blood transfusion after an auto accident. They learn that neither of them can donate blood to their son because they are incompatible. It turns out also that neither parent can give blood to the other parent. What are the blood type genotypes and phenotypes of this couple and their son? One parent must be A/O , blood type A, the other must be B/O , blood type B, the son is O/O , blood type O 3. (5 points) Drosophila has 3 pairs of autosomes and one pair of sex chromosomes. One peculiarity of this organism is that crossing over does not occur in males. In a completely heterozygous Drosophila male, how many different kinds of gametes can be formed? 2 4 = 16 kinds of gametes
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Page 2 of 6 4. (8 points) Sporulation of a + / arg1 heterozygous diploid in Neurospora gave rise to the following octads. How far is the arg1 gene from the centromere? + + + + arg1 arg1 arg1 arg1
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This note was uploaded on 09/13/2008 for the course BIO 325 taught by Professor Saxena during the Spring '08 term at University of Texas.

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e1_examples_key - Please print First name: (Do NOT write...

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