Which process would NOT contribute to genetic variation in a population?

Asexual reproduction is a process that typically results in offspring that are genetically identical to the parent organism, barring any mutations. This method of reproduction involves a single organism replicating its genetic material and dividing to create a new individual, which means that the genetic variation present in the population remains unchanged.

In contrast, other processes listed contribute to genetic variation. Mutation introduces new genetic variants into a population by altering the DNA sequence, genetic drift causes random changes in allele frequencies which can lead to variations, and gene flow moves alleles between populations, often increasing genetic diversity. Therefore, asexual reproduction stands out as the only process that does not promote genetic variation, as it produces clones rather than diverse offspring.