CBSE Class 10 Answered

Genetic drift is the random changes or alteration in gene frequencies which may lead to the loss of a particular character from the population completely or it may result in the alteration of a particular character causing variation.

For example: Some beetles are brown and some are green.

Green beetles get eaten by birds so their chances of survival to reproduce become very less.

Brown beetles survive they have chances of reproducing new generation of brown beetles.

So the chances of brown colouration is more in the population than the green colour.

If the same process continues all the individuals in the population will be brown.