BIO f325 Summer 2007 - Sample questions - I Exam

BIO f325 Summer 2007 - Sample questions - I Exam - GENETICS...

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GENETICS (BIO f325) SUMMER 2007 Sample questions (I Exam) _______________________________________________________________________ _ 1. (i) In the cross A/a; B/b; C/c; D/d x A/a; B/b; C/c; D/d , what proportion of the progeny are expected to be heterozygous at all four loci? (ii). Which of the following are examples of monohybrid crosses? (a) A/a x a/a (b) A/a x A/a (c) A/a;B/b x a/a;b/b (d) A/a;B/b x A/a;B/b (e) A/a;B/B x A/a;B/B 2. In the following pedigree, (i) Which of the following choices describes the most likely pattern of inheritance? (a) Autosomal dominant (b) Autosomal recessive (c) Cytoplasmic inheritance (d) X-linked recessive (e) Y-linked (f) X-linked dominant (ii) If III-1 and III-2 mate, what is the probability that their offspring will be affected? (Assume that II-1 and II-5 are homozygous for the normal allele) 1
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3. Complementation analysis of mutants a through f , affected in three genes, produces the following result, in which (+) represents complementation and (-) represents no complementation. Assuming that all of the missing mutant combinations would yield data consistent with the entries that are known, complete the table by assigning a (+) or (-) sign where these are not given. a b c d e f a - + - + b - - c - - d - e - + f 4. In terms of genes and chromosomes, explain why two traits might be inherited independently from one another. Also explain why two traits might not be inherited independently from each other. 5. The gene for yellow body color y in Drosophila is recessive and X-linked. Its dominant allele y + produces wild-type body color. In the following crosses, indicate the phenotype of the male and female offspring and mention the proportion of each phenotype. (i) yellow male x yellow female (ii) yellow female x wild-type male 6. Suppose that in sweet cherry a single gene controls fruit color [red (R-) is dominant to yellow (rr)] and a second gene controls bloom time [early bloom (E-) is dominant to late bloom (ee)]. A true breeding tree with red fruit and early 2
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bloom is crossed to a tree that has yellow fruit and blooms late.
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This note was uploaded on 03/20/2008 for the course BIO 325 taught by Professor Saxena during the Summer '08 term at University of Texas at Austin.

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BIO f325 Summer 2007 - Sample questions - I Exam - GENETICS...

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