Which of the following best describes the impact of purifying selection?
Correct answer: D. It removes variation from the population
- A. It increases the frequency of an allele
- B. It is the same as disruptive selection
- C. It increases genetic diversity
- D. It removes variation from the population
Explanation
Purifying selection, also known as negative selection, is a type of natural selection that acts to eliminate harmful or deleterious alleles from a population. By removing these detrimental genetic variants, purifying selection helps maintain the integrity and proper functioning of essential traits. As a result, it reduces genetic variation at the affected loci, ensuring that the population retains predominantly beneficial or neutral alleles. Therefore, describing purifying selection as a force that "removes variation from the population" accurately reflects its impact.
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Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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