A germ cell is part of the germline and is involved in the reproduction of organisms. Germ cells should not be confused with pathogenic "germs," they do not cause illnesses. There are different kinds of germ cells, which include gametogonia, gametocytes, and gametes. By a narrower definition, the term germ cell can also just refer to gametes, which are produced by meiosis of the aforementioned germ cells, but this definition is less precise. Cells that are not part of the germline are called somatic cells. Germline is a word used in biology and genetics. ... For other uses, see Reproduction (disambiguation) Reproduction is the biological process by which new individual organisms are produced. ... This article does not cite any references or sources. ... A gametogonium (plural gametogonia) is a germ cell that divides into gametocytes. ... A gametocyte is a eukaryotic germ cell that divides by mitosis into other gametocytes or by meiosis into gametes. ... A gamete is a specialized germ cell that fuses with another gamete during fertilization (conception) in organisms that reproduce sexually. ... Not to be confused with miosis. ... This article does not cite any references or sources. ...
Normal human somatic cells are diploid, which means they contain 22 pairs of chromosomes, plus 2 sex chromosomes. If XX = female or XY (Male). Human germ cells are normally haploid, which means they contain have half the chromosomes of somatic cells, or 22 chromosomes and one sex chromosome. Thus when the germ cells unite in fertilization, the cell becomes diploid, and commences building a body.
Epigenetics is the study of changes in gene regulation that occur without a change in DNA sequence (genotype). ... The Sertoli cell is the nurse cell of the testes. ... This article or section is in need of attention from an expert on the subject. ... The cells that give rise to the gametes are often set aside during cleavage. ... Not to be confused with miosis. ...
References
Germ Cells -Spermatogenesis
Derivation of Human Embryonic Germ Cells: An Alternative Source of Pluripotent Stem Cells
Germcell tumours are neoplasms derived from germcells.
In younger women germcell lesions are more common, thus in patients under the age of 21, 60% of ovarian tumours are of the germcell type, and up to one-third are malignant.
In males, germcell tumours occur typically after puberty and are malignant (testicular cancer).
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