The affect of genetic drift increases as the population size:
Correct answer: B. Decreases
- A. Increases
- B. Decreases
- C. Remains same
- D. None of these
Explanation
Genetic drift refers to the changes in allelic frequency in a population from generation to generation. It occurs when allele frequencies grow higher or lower by chance and typically takes place in small populations. Although genetic drift occurs in populations of all sizes, its effects tend to be stronger in small populations. This is also named neutral selection because most of the variations within and between species are due to random genetic drift of mutant alleles that are selectively neutral.
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About Evolution
Evolution describes heritable change in populations over generations through variation, natural selection and adaptation. Lamarckism explains inheritance of acquired characteristics, while Darwinism explains selection of favourable inherited variations; these historical explanations must not be confused with the modern genetic account of evolutionary change.
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