What happens in a population if the mating is not random?

If mating in a population is not random, it can lead to assortative mating where individuals preferentially mate with similar phenotypes, which can increase genetic homogeneity within subgroups. This non-random mating can also result in reduced genetic diversity and potentially increase the risk of inbreeding. Over time, these dynamics may affect the population's adaptability and resilience to environmental changes or diseases. Additionally, it may influence the evolutionary trajectory of the population by reinforcing certain traits.