Exam_1A_2009 - Genetics 380, Spring 2009 Examination #1A...

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Genetics 380, Spring 2009 Name (print) ________________________ Examination #1A Student #_________________________ Feb. 17, 2009 Section ( or TA ) ____________________ 1. ( 7 pts ) Consider a diploid organism with 3 pairs of chromosomes (A, B and C from the mother and A’, B’ and C’ from the father). While answering the questions below, assume that no crossing-over occurs during meiosis. (2 pts) What proportion of gametes would only have maternal chromosomes (A, B and C)? (5 pts) What proportion of gametes would have chromosomes inherited from both mother and father? 2. (8 pts ) In a human male, from which grandparent could each sex chromosome have been inherited? (Indicate yes or no for each option) Mother’s Mother’s Father’s Father’s Mother Father Mother Father X-chromosome ______ ______ ______ ______ Y-chromosome ______ ______ ______ ______
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3. ( 10 points ) In Mangoes, Red fruit (R) is dominant over Yellow (r), and Juicy fruit (J) is dominant over Fibrous (j). Given below are the phenotypes of the parents and their progeny. Determine the genotypes of the parents in each cross. (a) Red Juicy x Red Fibrous gives 3/8 Red Juicy; 3/8 Red Fibrous; 1/8 Yellow Juicy and 1/8 Yellow Fibrous. ________ X _______ (b) Red Fibrous x Red Fibrous gives 3/4 Red Fibrous and 1/4 Yellow Fibrous. ________ X _______ 4
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Exam_1A_2009 - Genetics 380, Spring 2009 Examination #1A...

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