In northern california, two types of pine trees grow in close proximity. one of the pine trees drops its pollen in march, and the other in may. their inability to cross pollinate is best described by which mechanism? a. genetic drift b. behavioral isolation c. temporal isolation d. geograpical isolation

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.