Prelim Answer Key - 1999 - ANIMAL SCIENCE 221 2nd Prelim...

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ANIMAL SCIENCE 221 2 nd Prelim April, 1999 - ANSWER KEY Part 1 . (Each answer is worth 1 point). 1. 1. Selection changes allele frequencies. In most cases, selection will act to fix an allele in the population; the exception is for OVERDOMINANCE where an equilibrium frequency is obtained. 2. 2. Progeny tests to detect recessive alleles in a suspected carrier using matings of the suspect to daughters of a known carrier and matings of the suspect back to its own progeny have the same q in mates. The advantage of the parent-offspring mating is that it SCREENS ALL LOCI and the disadvantage is it TAKES LONGER . 3. 3. The frequency of A -> a in a population is a function of MUTATION RATE and A LLELE (OR GENE) FREQUENCY . 4. 4. One-half the breeding value is the TRANSMITTING ABILITY and the difference between two BV's of individuals that differ in their genotype by BB versus Bb (or Bb versus bb) is referred to as AVERAGE EFFECT OF A GENE SUBSTITUTION . 5.
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Prelim Answer Key - 1999 - ANIMAL SCIENCE 221 2nd Prelim...

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