NEET 2021 Biology Paper

• Change in gene frequency in a small population by chance is known as genetic drift. Genetic drift has two ramifications, one is bottle neck effect and another is founder's effect.
• When accidentally a few individuals are dispersed and act as founders of a new isolated population, founder's effect is said to be observed.
• Crossing over which occurs during gamete formation results in genetic recombination.
• Mutations are random and directionless.