Heredity increases diversity among organisms by nonrandom mating, which is the preference of the organism to mate with another based on specific characteristics. Nonrandom mating has two forms. Inbreeding is the first form where organisms with the same genotypes will mate with each other resulting in minimal genetic diversity. Outbreeding is the second form where organisms of different genotypes will mate with each other resulting in an increase in genetic diversity. The variation in the heredity of an organism allows it to be more flexible and can also guarantee better survival rate of the population under the given environmental conditions.