Question

genetic variation: 14. what are the three main ways that genetic variation is produced? genetic drift: 15. what is genetic drift?

Explanation:

For question 14, genetic variation is produced mainly through mutation (permanent change in DNA sequence), genetic recombination (shuffling of genes during meiosis), and gene flow (transfer of genes between populations). For question 15, genetic drift is the random change in the frequency of alleles in a population over generations, especially significant in small populations.

Answer:

1. Mutation, genetic recombination, gene flow.
2. Random change in allele - frequencies in a population over generations, especially important in small populations.