In genetic drift, the allele frequencies in a gene pool change because of :
a) mutations.
b) chance.
c) natural selection.
d) genetic equilibirium.

The correct answer is B) chance

Allele frequencies in a gene pool change completely due to chance.

 genetic drift is the variation in  frequency of different genotypes in a small population, due to the chance disappearance of particular genes
In genetic drift, the allele frequencies in a gene pool change because of
 chance.
they have a chance of changing or not
so correct option is B
hope it helps

The correct answer is c

The answer to this will be from your lab notes/procedure. it would be best to ask another student who participated in the lab as we do not know what was done, what enzyme or if the temperature is celsius or fahrenheit. if i were to guess though i'd say the rate stopped due to enzyme denturing at high temperature