Male somatic chromosomes consist of 22 pairs of autosomes +XY. The female somatic chromosome consists of 22 pairs of autosomes +XX. However, the chromosome of male germ cells consists of 22 autosomes +X or y. The chromosome of female germ cells consists of 22 autosomes+X.
2. A healthy person didn't find 24 pairs of chromosomes.
People with 24 pairs of chromosomes may suffer from various diseases, especially infertility. When chromosomes are abnormal, hereditary diseases can be formed.
Extended data
Principle of chromosome abnormality:
The number of somatic chromosomes in normal people is 23 pairs, which has a certain shape and structure. The abnormality of chromosome in morphological structure or quantity is called chromosome abnormality, and the diseases caused by chromosome abnormality are chromosome diseases. At present, there are 100 chromosome diseases, which can often cause abortion, congenital stupidity, congenital multiple malformations, cancer and so on.
The incidence of chromosomal abnormalities is not uncommon, which can reach 0.5%~0.7% in the general newborn population. For example, there may be 15~20 cases of chromosomal abnormalities based on the average number of 3000 newborns born in our hospital every year. In early spontaneous abortion, about 50%~60% is caused by chromosome abnormality.
The common causes of chromosomal abnormalities are ionizing radiation, chemical contact, microbial infection and heredity. The purpose of clinical chromosome examination is to find chromosomal abnormalities and diagnose diseases caused by chromosomal abnormalities.
References:
Baidu encyclopedia-chromosome