Genetic drift is a random change in allele frequencies over the generations. It is brought by chance alone. Gene flow or gene migration is the physical movement of alleles into and out of a population. The existence within the population of disadvantages alleles in heterozygous genotypes is known as genetic code.
Variation in gene frequencies within populations can occur by chance rather than by natural selection. This is referred to as
NEET UG 2013 — Zoology Evolution
2013mcqmedium
Variation in gene frequencies within populations can occur by chance rather than by natural selection. This is referred to as
Official previous-year question
Held on 30 Apr 2013 · Verified 9 Jul 2026.
Options
- A
genetic flow
- B
genetic drift
- C
random mating
- D
genetic load
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