Question:

Which of the following is not true for a species ?

Updated On: Oct 12, 2023
  • Members of a species can interbreed
  • Variations occurs among members of a species
  • Each species is reproductively isolated from every other species
  • Gene flow does not occur between the populations of a species
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The Correct Option is D

Solution and Explanation

Gene flow can and does occur between populations of the same species. Gene flow is the exchange of genetic material (such as alleles) between different populations within a species, and it helps maintain genetic diversity and the cohesion of a species over time. The other statements are generally true for a species: members of a species can interbreed, variations occur among members of a species, and each species is reproductively isolated from every other species.

So, the correct option is (D): Gene flow does not occur between the populations of a species

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Concepts Used:

Evolution

Evolution is a process that occurs in changes in the genetic content of a population over time. Evolutionary change is generally classified into two: microevolution and macroevolution. The process of changes in allele frequencies in a population over time is a microevolutionary process. Three main mechanisms that cause allele frequency change are natural selection, genetic drift, and gene flow. On the other hand, macroevolution refers to change at or above the level of the species.