PrE2C_key - Biology 352 1. The data to the right come from...

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Biology 352 Exam #2 1 of 7 1. The data to the right come from a microsatellite study of two ring seal populations: one small population is isolated and landlocked in Lake Saimaa. The “marine” population consists of all seals in the open ocean. The alleles are named “195”, “191”, “189” … and so on. For example, the frequency of allele “189” in Lake Saimaa is 0.156. This locus is called “Hg8.10”, and it is in a region of DNA that does not code for anything. Calculate H e for Lake Saimaa. a. 0.132 b. 0.263 c. 0.737 d. 0.844 e. 0.929 2 pq = 2*0.156*0.844 2. Which population is polymorphic for this gene? a. Lake Saimaa b. Marine c. both d. neither 3. Pituitary dwarfism is a caused by a homozygous recessive condition at the growth hormone gene GH1. The forward rate of mutation from the normal gene to the mutant form is 1 x 10 -6 . The backward rate of mutation is so small that it can be ignored. If the frequency of the mutant allele is now 0.1000, what will it be in 1000 generations? Assume no natural selection or drift. a. 0.0000 b. 0.0999 c. 0.1000 d. 0.1009 e. 0.8991 p = 0.9, q = 0.1 p 1000 = 0.9 (1 – 1x10 -6 ) 1000 = 0.8991 q 1000 = 1 - p 1000 = 0.1009 4. A brand new mutation has a 2% probability of eventually becoming fixed through the action of genetic drift alone. How big is the population? (Assume that the species is diploid.) a. 20 b. 25 c. 50 d. 100 e. 200 prob. of fixation = frequency of the allele. A new mutation has a frequency of 1/2N. 0.02 = 1/2N, so N = 25 5. Tall Guys Get the Girls: Short Men Less Likely to Marry, Have Kids by Rick Callahan, The Associated Press. Jan. 12, 2004 — If it seemed as if the tall guys got all the girls in high school, it wasn’t your imagination. New research suggests taller men are more likely to marry and tend to have more children than short guys. What’s behind the phenomenon — whether women prefer taller men or those men are simply more outgoing — is up for debate. But the numbers clearly stack up against shorter guys. Polish and British scientists studied the medical records of about 3,200 Polish men ages 25 to 60 and found that childless men were on average 1.2 inches shorter than men who had at least one child. Bachelors were about an inch shorter on average than married men. … The findings were published in Thursday’s issue of the journal Nature. This is an example of a. inbreeding b. positive assortative mating c. viability selection d. sexual selection e. gametic selection
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Biology 352 Exam #2 2 of 7 There is no information on nonrandom mating in this article. It states that taller men are more likely to mate. This is the definition of sexual selection. 6. The trait of interest in the last question (height) is a _______________ trait. a. Mendelian b. pleiotropic c. quantitative d. meristic e. threshold Height in humans is a quantitative, continuous trait. 7. In a population of sea bass, 80 randomly surveyed individuals have genotypes as follows. 15 are DD , 36 are Dd and 29 are dd . Does this locus depart from Hardy-Weinberg frequencies? (For 1 degree of freedom χ 2 > 3.84 is significant.) a. Yes. χ 2 = 323.5 b. Yes. χ 2 = 11.6 c. No. χ 2 = 0.41 d. No. χ 2 = 0.08 e. No. χ 2 = 0.0051 Observed DD Dd dd Sum 15 36 29 80 Allele frequencies: A a 0.413 0.588 Expected AA Aa aa Sum
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This note was uploaded on 05/07/2011 for the course BIOLOGY 352 taught by Professor Townsend during the Spring '08 term at San Diego State.

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PrE2C_key - Biology 352 1. The data to the right come from...

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