Answer :
When a population is reproductively isolated from other populations of its kind, gene flow cannot occur.
Gene flow, sometimes referred to as gene migration, geneflow, and allele flow in population genetics, is the exchange of genetic material between populations. A population can be deemed to be a single effective gene flow population if two populations have equal allele frequencies and the rate of gene flow is high enough. It has been population demonstrated that all it takes is "one migrant each generation" to stop populations from drifting apart. [1] Depending on how severe the selection pressure is, populations can diverge even when they are gene flow exchanging alleles. The spread of genetic variation between populations is facilitated by gene flow. By altering allele frequencies, population migrants alter the genetic diversity of communities (the proportion of members carrying a particular variant of a gene).
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