NEET BIOLOGY

Detailed explanation-1: -Over time, as generations of individuals with the trait continue to reproduce, the advantageous trait becomes increasingly common in a population, making the population different than an ancestral one. Sometimes the population becomes so different that it is considered a new species.

Detailed explanation-2: -Adaptation to environment and evolution: Variation helps certain members of a population to adapt to changing conditions. Because natural selection mainly affects phenotypes, more genetic variation within a population typically leads to more phenotypic diversity.

Detailed explanation-3: -New species form by speciation, in which an ancestral population splits into two or more genetically distinct descendant populations. Speciation involves reproductive isolation of groups within the original population and accumulation of genetic differences between the two groups.

Detailed explanation-4: -variation, in biology, any difference between cells, individual organisms, or groups of organisms of any species caused either by genetic differences (genotypic variation) or by the effect of environmental factors on the expression of the genetic potentials (phenotypic variation).