Natural selection acts directly on ...
a) alleles.
b) genes.
c) phenotypes.
d) mutations.
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?
a) The population is expanding.
b) The population is evolving.
c) The population is decreasing.
d) The population is not evolving.
Sexual reproduction among members of a population results in ...
a) different types of alleles in the gene pool.
b) changes in the allele frequencies in the gene pool.
c) no changes in the allele frequencies in the gene pool.
d) an absence of genetic variation in the population.
Genetic Recombination includes the independent movement of chromosomes during meiosis as well as ...
a) mutations from radiation
b) changes in the allele frequencies
c) crossing-over
d) mutations from chemicals
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