... combinations of maternal and paternal origin alleles on homologous chromosomes through crossing over at chiasmata. -this is done by producing new combinations of maternal and paternal origin alleles on homologous chromosomes and their alleles, through independent assortment. -producing variation in gametes in sexual reproduction. -random fusion of gametes at fertilization brings together new combinations of alleles. * Natural Selection- This is the process by which one or more environmental factors affect the survival rates of different phenotypes in the population. A species exists as populations, groups of organisms of the same species, living in the same habitat and able to interbreed. * Evolution-a change in the frequency of alleles in a population and acts on populations not on species. * Intraspecific competition and interspecidfic competition. * Speciation ...

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