Variation is an important contributor in the process of evolution. Which of the following factors does not contribute new variation in a population?

Correct option is C

Correct Answer: (c)
Explanation:
Genetic drift does not create new genetic variation; it randomly changes the frequency of existing alleles, often reducing variation in small populations.
Information Booster:
Mutation is the ultimate source of new alleles.
Crossing over (recombination) generates new allele combinations.
Sexual reproduction (independent assortment + fusion of gametes) reshuffles alleles.
Drift can lead to fixation or loss of alleles.
Reduced variation from drift can limit adaptive potential.
Additional Information (Incorrect Options):
(a) Sexual reproduction → increases combinatorial variation.
(b) Mutation → introduces novel alleles.
(d) Crossing over → produces recombinant chromosomes; adds variability.