A. The Heated Soil Scenario Walter placed 240 grams of sand (S), potting soil (P), and a mixture of sand and soil (M) into
separate containers. In each of the containers he placed a thermometer so that the bulb was
2.5 cm below the surface. He placed all 9 containers under identical heat lamps for an hour.
After heating the containers in three separate trials, the temperatures were (all are in degrees
centigrade):
S: 28, 27, 26
P:33, 29, 31
M: 29, 29, 22.5

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.