Gene recombination occurs in every generation of diploid organisms. Two copies of each chromosome may have different alleles at some positions. By exchanging the corresponding parts of each chromosome, recombinant chromosomes of different parents can be produced. Recombination originated from the physical exchange of chromosomal material. In the prophase of meiosis, each chromosome has four copies, which are closely linked and interrelated.
Extended data:
The difference between gene recombination and gene mutation;
Gene recombination refers to the sequence exchange between homologous chromosomes or two DNA molecules with similar sequences. Because of the different recombination positions, some recombination may also lead to gene mutation, such as the recombination link destroying the original gene sequence.
Gene mutation does not involve other DNA, including homologous chromosomes, but refers to the change of its own DNA molecules, such as the change and deletion of base sequence. From the molecular level, gene mutation refers to the change of base pair composition or arrangement order of genes in structure. Although genes are very stable and can accurately replicate themselves during cell division, this stability is relative.
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