07_Midterm_I_KEY

07_Midterm_I_KEY - EEMB 129 Midterm I 2007 Name_ Perm #_...

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EEMB 129 Midterm I Name____________________________ 2007 Perm #___________________________ Read each question carefully before you answer it. Make sure that you show your work. 1. (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 1 x 4 will have the disease. Prob = 0.5 * 1 = 0.5 (4 pts) Genotypes – 4 pts 2. (12 pts) 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 would be expected in each phenotypic class? 300 – Tall 100 - Short c. (4 pts) How many of the F2 would be expected to be pure breeding when selfed? 200 (100 TT and 100 tt) 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 Midterm I Name____________________________ 2007 Perm #___________________________ 3. (15 pts). In the rat the allele for pigment (P) is dominant to the allele for no pigment (p). At another unlinked locus, the allele for black (B) is dominant to the allele for cream (b). If a pigment allele (P) is absent, alleles B and b are inoperative. Predict the genotypes, phenotypes
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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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07_Midterm_I_KEY - EEMB 129 Midterm I 2007 Name_ Perm #_...

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