21. What is genetic drift? a. Random change in population number
b. Random change in the amount of DNA in a population
c. A method of determining the relative age of a population
d. Random change in the allele frequency of a population
e. How scientists determine if two organisms are related

B.

Genetic drift is the change in the frequency of an existing gene variant in a population due to random sampling of organisms.

essentially, one bacterial cell splits into two daugurer cells. bacterial offspring don't need or get care from their parents because they are in a sense their own parents. that said, some bacteria can and do depend on other bacteria especially in harsh environments such as bacterial microfilms in hot water tanks.