3. Which of the following is not an example of an ecological study? a. How tendons and ligaments enable movement in mammals.
b. Population growth in fruit flies.
C. The food web of the Serengeti.
d. How foreign barnacles affect the health of local ecosystems.

Whenever diploid populations are in hardy-weinberg equilibrium at a particular locus a) the allele's frequency should not change from one generation to the next, but its representation in homozygous and heterozygous genotypes may change. b) natural selection, gene flow, and genetic drift are acting equally to change an allele's frequency. c) this means that, at this locus, two alleles are present in equal proportions. d) the population itself is not evolving, but individuals within the population may be evolving.