Evolution

The frequency of an allele in a gene pool of a population depends on many factors
and may be stable or unstable over time. As a basis for understanding this concept:
a. Students know why natural selection acts on the phenotype rather than the genotype
of an organism.
b. Students know why alleles that are lethal in a homozygous individual may be
carried in a heterozygote and thus maintained in a gene pool.
c. Students know new mutations are constantly being generated in a gene pool.
d. Students know variation within a species increases the likelihood that at least
some members of a species will survive under changed environmental conditions.
e.* Students know the conditions for Hardy-Weinberg equilibrium in a population
and why these conditions are not likely to appear in nature.
f.* Students know how to solve the Hardy-Weinberg equation to predict the frequency
of genotypes in a population, given the frequency of phenotypes.