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CBSE Class 10 Answered

please explain what is genetic drift,gene pool,gene flow and speciation
Asked by Priya Rai | 25 Nov, 2010, 11:55: PM
answered-by-expert Expert Answer
Dear student,
Genetic drift refers to random fluctuations in the frequency of the appearance of a gene in a small isolated population, presumably owing to chance rather than natural selection. Genetic drift can result in genetic traits being lost from a population or becoming widespread in a population without respect to the survival or reproductive value of the gene pairs involved. A random statistical effect, genetic drift can occur only in small, isolated populations in which the gene pool is small enough that chance events can change its makeup substantially.
 
Gene pool is the combination of all genes and gene variations of a specified group.
 
Gene flow (also known as gene migration) is the transfer of alleles of genes from one population to another.
Speciation is the the evolution of a biological species

Regards,
Team Topperlearning
Answered by | 27 Nov, 2010, 09:11: PM

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