NEET BIOLOGY

Detailed explanation-1: -Gene flow is the movement of genes into or out of a population. Such movement may be due to migration of individual organisms that reproduce in their new populations, or to the movement of gametes (e.g., as a consequence of pollen transfer among plants).

Detailed explanation-2: -Immigration is the movement of individuals into a population from other areas. This increases the population size and growth rate. Emigration is the movement of individuals out of a population. This decreases the population size and growth rate.

Detailed explanation-3: -Migration. Migration is the movement of organisms from one location to another. Although it can occur in cyclical patterns (as it does in birds), migration when used in a population genetics context often refers to the movement of individuals into or out of a defined population.

Detailed explanation-4: -Gene flow within a population can increase the genetic variation of the population, whereas gene flow between genetically distant populations can reduce the genetic difference between the populations.

Detailed explanation-5: -Emigration happens when genetically unique organisms leave one population for another. It is another form of gene flow, but it usually results in decreased genetic diversity. This is because rare alleles leave the existing gene pool.