How many sets of logous chromosomes are present in a cell?

There are 22 pairs of logous chromosomes in a normal somatic cell that undergoes mitosis. There are also the XX and XY chromosomes, but they are not considered logous since if you are a male and have XY the two chromosomes are not logs of each other. At the beginning and end of mitosis there are always 22 pairs of logous chromosomes. The only time this changes is during meiosis when the gametes are produces. In meiosis, the logous chromosomes are split in half to produce a haploid cel with only one copy of each chromosome instead of two. The reason for this is because the haploid gamete is produced so a second gamete can fertilize it. Thus, each individual will receive one set of chromosomes from each parent. At the very beginning of meiosis the cells contain the full set of homologous chromosomes (diploid), but at the end of meiosis the cell contains only one set, now haploid.