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: -Genetic Drift. Genetic drift is the change in frequency of an existing gene variant in the population due to random chance.

Detailed explanation-3: -A mutation is a change in the DNA sequence of an organism. Mutations can result from errors in DNA replication during cell division, exposure to mutagens or a viral infection.

Detailed explanation-4: -“We always thought of mutation as basically random across the genome, ” said Grey Monroe, PhD, an assistant professor in the University of California, Davis, department of plant sciences. “It turns out that mutation is very nonrandom and it’s nonrandom in a way that benefits the plant.

Detailed explanation-5: -A mutation is a change that occurs in our DNA sequence, either due to mistakes when the DNA is copied or as the result of environmental factors such as UV light and cigarette smoke. Mutations can occur during DNA replication if errors are made and not corrected in time.