Crossover is the process of exchanging homologous regions of homologous chromosomes (chromatid). Usually crossing over occurs in meiosis I. When crossing over, genetic material (alleles) is exchanged between chromosomes, and then recombination occurs – the appearance of new combinations of alleles. Thus providing combinational variability in populations and providing material for natural selection.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.