Question

describe any three ways by which an individual with a particular trait may increase in a population

Answer 1

Speciationis the process in which one or more species arise from previously existing species. A single species may give rise to a new species or two different species may give rise to a new species. By the folling ways the traits can be increased in the population which in turn leads to speciation.GENETIC DRIFT:-When the frequency of some genes gets changed in a small population due to some accidental reasons, such phenomenon is known as Genetic Drift. Genetic drift can give rise to different changes in sub-populations. It is random andrarely produces adaptations to the environment.NATURAL SELECTION:-It may be defined as a process that results in the increasedsurvival and reproductive success of individuals, who are well adjusted to theenvironment. Theory of natural selection wasgiven by Charles Robert DarwinGeographic isolationrefers to a situation where a species, or a population of a species, becomes separated by a physical barrier (a lake, ocean, mountains, etc.), allowing each group to diverge along separate evolutionary paths.The effect of geographic isolation is that the two populations are subjected to different selection pressures, since the conditions in the two areas will be different. So different alleles will be selected for, and genetic differences will gradually accumulate between, the populations.In time, enough genetic differences will occurso that the two populations will no longer interbreed. Then, by definition, they have become different species.Hope it helps

Answer 2

Natural selection
Reproductive isolation
Geographical isolation
Mutation