Q162 / 180 · NEET 2016 (Phase 2) · Zoology

Genetic drift

  • Correct answer
    A
    occurs by chance
  • B
    does not affect Hardy-Weinberg equilibrium
  • C
    do not change the frequency of genes and alleles in future generation
  • D
    slows down the formation of reproductive population

Solution

Genetic drift operates in small isolated inbreeding populations. Genetic drift is a mechanism of evolution in which allele frequencies of a population change over generations due to chance. Genetic drift occurs in all populations of non-infinite size, but its effects are strongest in small populations by affecting the Hardy-Weinberg equilibrium. Genetic drift can have major effects when a population is sharply reduced in size by a natural disaster.

Hence, the correct answer is option: 'A'.

Relevant Questions