Question

There are numbers of ways by which genes enter a population. Explain briefly the three ways

Answer 1

1)Speciation: speciation is the splitting of one species into two or more species or transformation of one species into a new species over period of time due to geographical barrier or reproductive isolation.2) gene flow: it is the movement of alleles or genes between population of the same species by migration of individual which can interbreed among themselves.3) genetic drift: In small populations, accidents can change the frequency of some genes in a population,even if these give no survival advantage to the possessors . This phenomenon is called genetic drift.Genetic drift can be defined as change in gene frequency which occurs by chance in a small population.brainliest plsssssssssss

Answer 2

Actually genes undergo a change that causes variation. Variations are caused during DNA copying

the factors which play a vital role in changing the population of a specie are:

1) Change in Gene Frequency: When new variation are caused they exist in a small proportion of the population. But due to any accident it may increase while the former one might fall by its population.

2) Natural Selection: When a variation tends to give a survival benefit to the organism, there are more chances that the population of that variation will increase in future.

3) Genetic Drift: This is totally an accidental phenomenon where the gene frequency of the population of specie changes due to any accident. it may result in the increase in the population of the beneficially variated population or even in decrease of it or even increase the variated population that does not provide any advantage.

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Meera .revankar answered this

Gene flow refers to the transfer of alleles from one population to another as a result of interbreeding between members of two populations.

Mutation:  are the sudden changes that takes place in the DNA sequence of an  organism.

Migration: Migration will change gene frequencies by bringing in more copies of an allele already in the population or by bringing in a new allele that has arisen by mutation.