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: -Gene flow in plants occurs through mechanisms that move either the gametes or the entire organism. For example, wind and pollinating animals may move pollen, spores or seeds from one population to another, creating gene flow. For example, bees carry pollen from one plant to another introducing gene flow.

Detailed explanation-3: -A man with very dark skin moves to a remote village in Eastern Europe, where most people have light skin. Their children and grandchildren show evidence of this genetic flow when some are born with dark skin. Several red foxes move into and mate with a silver fox population.

Detailed explanation-4: -The effect of gene flow is to reduce genetic differences between populations, thereby preventing or delaying the evolution of the populations in different geographical areas into separate species of the pathogen.