Question

Why does recombination occur?

Answer 1

We need to understand recombination in biological terms along with its importance. Recombination is an important concept in genetics. As the name suggests, recombination means reshuffling. From the genetic point of view, it is nothing but the reshuffling of the genetic material. When two DNA molecules swap portions of their genetic material, this is known as recombination.

Complete answer:
Genetic recombination is the interchange of genetic material between organisms that results in the creation of offspring with characteristics that are distinct from either parent. Genetic recombination during meiosis in eukaryotes can result in a new collection of genetic information that can be handed down from parents to children. The majority of recombination occurs spontaneously. In eukaryotes, genetic recombination occurs during meiosis, when homologous chromosomes are paired. This might be followed by chromosome-to-chromosome information transmission. The information can be sent without any physical transaction.In eukaryotes, recombination may also happen during mitosis, and it usually includes the two sister chromosomes that arise following chromosomal replication. Because the sister chromosomes are generally identical, no novel allele combinations are created in this scenario. Recombination occurs between comparable DNA molecules during meiosis and mitosis (homologous sequences). Non-sister homologous chromosomes mate with each other during meiosis, resulting in recombination between non-sister homologs. Recombination between homologous chromosomes is a frequent DNA repair process in both meiotic and mitotic cells.
The primary objective of recombination is genetic variation. Individual genetic variations serve as the foundation for natural selection, which permits species to develop and adapt to changing environmental conditions. Recombination is a crucial step in this process because it allows genes to be reassorted into new combinations. Recombination is required for homologous pairing during meiosis, but it also offers at least two other advantages for sexual organisms. It creates novel allele combinations along chromosomes and limits the consequences of mutations to the area surrounding a gene rather than the entire chromosome.

Note:
Note that recombination during meiosis in eukaryotes is aided by chromosomal crossing. The crossover process results in children with different gene combinations than their parents, and it can occasionally result in novel chimeric alleles. Genetic recombination causes gene shuffling, which results in more genetic variety. The crossing-over value is the measured recombination frequency between two loci. It is the frequency with which two connected gene loci (markers) cross across, and it is determined by the genetic locus's mutual distance.