Florida International University

PCB evolution

Chapter 8

1)Which information do we need to predict the allelic frequencies after one round of selection in a given population?

1. selection coefficients for each genotype/allelic frequencies in the present generation.
2. mutation rate/frequency of heterozygotes in the present generation.
3. allelic frequencies in the present generation.
4. fitness values for each genotype.

2. The presence of                 suggests the                of Hardy-Weinberg equilibrium.

1. mutation/absence.
2. random genetic drift/absence.
3. all of the above.
4. selection/absence.

3. According to the fundamental conclusions of the Hardy-Weinberg Equilibrium principle:
   1. the allele frequencies                 throughout generations and (2) if allelic frequencies are given by p and q,   are given by                     .

1. will evolve/genotypic frequencies/random genetic drift.
2. will not change/genotypic frequencies/p², 2pq, q².
3. will evolve/genotypic frequencies/p², 2pq, q².
4. will not change/genotypic frequencies/random genetic drift.

4. Selection constitutes a violation of the Hardy-Weinberg equilibrium because                        .

1. it changes allelic frequencies across generations.
2. it alters the number of individuals in the population.
3. None of the above.
4. it changes genotypes across generations.

5. From the Population Genetics perspective, evolution is the                     in the                of               

across               .

1. change/frequencies/genotypes/generations.
2. change/frequencies/alleles/populations.
3. change/frequencies/alleles/generations.
4. change/frequencies/mutation rates/generations.

6. The selective outcome of overdominance in the population will be                      .

1. an equilibrium state in which both alleles coexist in the population.
2. the random fixation of one of the alleles in the population.
3. a brief period of time during which both alleles coexist in the population.
4. a selective sweep.

7. Complete elimination of deleterious recessive alleles from populations by selection is rare because                                          .

1. random genetic drift.
2. natural selection is random.
3. mutation rates are often high.
4. heterozygotes hide recessive alleles from selection.