NEET BIOLOGY

Detailed explanation-1: -Genetic variations can arise from gene variants (also called mutations) or from a normal process in which genetic material is rearranged as a cell is getting ready to divide (known as genetic recombination). Genetic variations that alter gene activity or protein function can introduce different traits in an organism.

Detailed explanation-2: -The genetic diversity has three different sources: mutation, recombination and immigration of genes.

Detailed explanation-3: -Major causes of variation include mutations, gene flow, and sexual reproduction. DNA mutation causes genetic variation by altering the genes of individuals in a population. Gene flow leads to genetic variation as new individuals with different gene combinations migrate into a population.

Detailed explanation-4: -Variations occur as a result of sex chromosomes. Variations in the organism’s germplasm genes are heritable. Mother and father contribute to the gene pattern of their offspring via their chromosomes, which undergo recombination during gametogenesis.