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Prelim Answer Key - 1998

Prelim Answer Key - 1998 - ANIMAL SCIENCE 221 2nd Prelim...

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ANIMAL SCIENCE 221 2 nd Prelim MARCH, 1998 - ANSWER KEY Part 1 (Each answer is worth 1 point). 1. The Hardy-Weinberg Law states that a large, random mating population will remain in equilibrium in the absence of three forces that change gene frequencies. These forces are: 1. Selection 2. Mutation, genetic drift 3. Migration 2. For a single locus, the genetic value can be partitioned into two components. These are: 1. Breeding value 2. Dominance 3. The magnitude of the impact of migration on gene frequencies depends on two things. These are: 1. Proportion migrating 2. Difference in gene frequency 4. For an autosomal locus, if gene frequencies in males and females are different, it takes two generations of random mating to reach equilibrium. What happens in each generation? Generation 1. Frequencies become equal 2. Reach equilibrium 5. Selection will fix the favored gene except when the heterozygote is the favored genotype. The mode of inheritance, for the heterozygote being favored, is referred to as OVERDOMINANCE .
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Part 2 1. For a sex-linked gene, assume f(X
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