MidTerm_I_2008_KEY - EEMB 129 Midterm I 2008 Name_ Perm #_...

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EEMB 129 Midterm I Name____________________________ 2008 Perm #___________________________ Read each question carefully before you answer it. Make sure that you show your work. 1. (9 pts) List three characteristics of the garden pea made it a good organism for Mendel to deduce the basic principles of inheritance. Rapid Generation time Can self fertilize/inbred lines Large number of offspring Can cross Many variants available 2. (9 pts) Mendel made a number of conclusions about heredity from his experiments with garden peas. List three of these conclusions. 1. hereditary determinants can be particulate (genes) 2. each adult has 2 genes (F 1 plants must have had 2 since recessive traits reappeared in later generations) 3. the gene pairs segregate equally (randomly) in eggs and sperm MENDEL'S FIRST LAW 4. eggs and sperm only contain one member of a gene pair 5. gametes combine at random (no 'preference' for combinations of particular gene pairs) 3. (4 pts) Mendel studied seven different traits of the garden pea (flower color, seed shape, seed color, pod color, pod shape, flower position and plant height). The segregation of each of these traits was independent of the segregation at the other traits (i.e., the genes are unlinked). If you had a plant that was heterozygous at all seven loci, how many gamete-types could this plant produce? 2 * 2 * 2 * 2 * 2 * 2 * 2 = 128 4. (8 pts) The achoo syndrome (sneezing in response to bright light) and trembling chin (triggered by anxiety) are both dominant traits in humans. These genes are unlinked. a) What is the probability that the first child of parents who are heterozygous for both the
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This note was uploaded on 10/16/2010 for the course EEMB 129 taught by Professor Ajnarivera during the Spring '09 term at UCSB.

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MidTerm_I_2008_KEY - EEMB 129 Midterm I 2008 Name_ Perm #_...

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