Hodges_06 FINAL_KEY

Hodges_06 FINAL_KEY - EEMB 129 FINAL EXAM 2006 Name_ Perm...

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EEMB 129 FINAL EXAM Name____________________________ 2006 Perm #___________________________ Read each question carefully before you answer it. Make sure that you show your work. 1. (12 pts total) In pea plants, tall plant height (T) is dominant over short (t). Pure-breeding tall and short plants are crossed. a. (4 pts) What will be the genotype and phenotype of the F1? Tt - Tall b. (4 pts) If the F1 is selfed and 400 F2 plants are raised, how many plants would be expected in each phenotypic class? 300 – Tall 100 - Short c. (4 pts) How many of the F2 plants would be expected to be pure breeding when selfed? 200 (100 TT and 100 tt) 2. (12 pts) Below is a pedigree of a human genetic disease in which stricken individuals are represented by solid color. Is the disease caused by a dominant or recessive allele? Indicate the genotypes of as many individuals as possible. Calculate the probability an offspring of the cousin marriage 2 x 3 will have the disease. Prob = 0.5 * 0.5 = 0.25 (4 pts) Genotypes – 4 pts 1 2 3 4 Recessive 4 pts aa aa aa aa Aa Aa Aa Aa A- Aa Aa Aa
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EEMB 129 FINAL EXAM Name____________________________ 2006 Perm #___________________________ 3. (9 pts) For a single locus, two-allele genetic system list three reasons that classic Mendelian ratios might not be obtained. 3 pts each for any of the following: No pts for two locus systems: sex-linked, X-linked, Y-linked epistasis lethals pleiotropy incomplete dominance linkage codominance non-disjunction
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Hodges_06 FINAL_KEY - EEMB 129 FINAL EXAM 2006 Name_ Perm...

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