CBSE Class 10 Answered

Gene flow (also known as gene migration) is the transfer of alleles of genes from one population to another. This exchange of genetic traits between populations occurs by movement of individuals, gametes, or spores. It involves the spread of new variants among different populations through dispersal. Lack or low gene flow is considered detrimental because it does not yield a great amount of variability (gene pool) from which the population can use to overcome changing environmental conditions. Gene flow introduces new alleles into a population and makes populations more similar genetically to one another. Continuous gene flow prevents the formation of new species.