1. Natural selection acts directly on an organism’s ___________. (1 point)
Unselected answer (0 pts) chromosomes
Unselected answer (0 pts) alleles
Unselected answer (0 pts) genotype
Correct answer (1 pt) phenotype
1 /1 point
2. In a fox population, the allele frequency of a gene for red fur changes from 20 percent to 30 percent. What can you say about that population of foxes? (1 point)
Unselected answer (0 pts) The population is expanding.
Correct answer (1 pt) The population is evolving.
Unselected answer (0 pts) The population is decreasing.
Unselected answer (0 pts) The population is not evolving.
1 /1 point
3. If two eukaryotes participate in lateral gene transfer what will this do to the overall genetic variation of the species? (1 point)
Unselected answer (0 pts) Nothing, the genetic variation will stay the same.
Unselected answer (0 pts) The genetic variation will decrease.
Correct answer (1 pt) The genetic variation will increase.
Unselected answer (0 pts) This type of gene transfer is impossible in eukaryotes.
1 /1 point
4. The number of phenotypes produced for a given trait depends on (1 point)
Correct answer (1 pt) the number of genes that control the trait.
Unselected answer (0 pts) which form of the trait is dominant.
Unselected answer (0 pts) the allele frequencies of the various alleles.
Unselected answer (0 pts) the relationship of allele frequencies to Mendelian ratios.
1 /1 point
5. A polygenic trait can have (1 point)
Unselected answer (0 pts) many possible genotypes, but few possible phenotypes.
Correct answer (1 pt) many possible genotypes, producing many possible phenotypes.
Unselected answer (0 pts) fewer phenotypes than most single-gene traits.
Unselected answer (0 pts) fewer genotypes than most single-gene traits.
1 /1 point
