What is genetic recombination?

• A. The process of natural selection shaping a population
• B. The physical mixing of genetic material during meiosis
• C. The formation of entirely new genes through mutation
• D. The selective elimination of certain alleles in a population

Answer: (B)

Genetic recombination refers specifically to the physical mixing of genetic material that occurs during meiosis, particularly during the process of crossing over. During meiosis, homologous chromosomes pair up and exchange segments of genetic material. This exchange results in offspring that have a different combination of genes than either parent, increasing genetic diversity within a population.

This recombination is crucial for evolution and adaptation, allowing for new gene combinations that may benefit the organism in its environment. In contrast, the other options focus on different genetic processes. Natural selection, for example, involves environmental pressures that influence which alleles are passed on to the next generation but does not involve the mixing of alleles at the genetic level. Similarly, mutations create new genes but are not a process of recombination, and the selective elimination of alleles pertains to the loss of genetic variation rather than the combination of existing genetic material.