Well most population within a species have very similar gene pools, like most human are 99% similar in their DNA, but the thing is, the closer you are related the more similar you gene pool will be. By hybridization you are literally introducing something new to the gene pool. So maybe you have a whole herd of white goat, but then you crossbred it with a black goat (i don't know if black goat exists or not), this introduces a genetic variation into your white goats, now the offspring will have black fur allele in their gene. That is what hybridization do.
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The introduction of animals into a breeding population that are unrelated will increase genetic variation.
Plant hybridization is the process of creating plant hybrids, often as new species of plants. This is done by crossing genetics from two different types or species of plants and joining them to make a new plant.
Genetic variation is one of the conditions required for Natural Selection to occur.
A large population increases genetics variation. Mutation will also increase genetics variation.
Meiosis is responsible for genetic variation