Cells, germ
The eggs and sperm are the germ cells: the reproductive cells. Each mature germ cell is haploid in that it has a single set of 23 chromosomes containing half the usual amount of DNA and half the usual number of genes. Except for the eggs and sperm, each cell in the human body — there are 100 trillion cells in each of us — contains the entire human genome, all the genetic information necessary to build a human being, and this information is encoded within the cell nucleus in 6 billion base pairs, subunits of DNA, packaged in 23 pairs of chromosomes, one chromosome in each pair coming from each parent. The germs cells — the eggs and sperm — are thus notable exceptions to the usual rules governing chromosomes, genes, and DNA.

Medical dictionary. 2011.

Look at other dictionaries:

  • Germ cell — Germ cells are progenitors of the gametes. These singled out cells move through the gut to the developing gonads and undergo mitotic proliferation followed by meiosis and differentiation into either eggs or sperm (mature gametes). Plants do not… …   Wikipedia

  • Germ cell tumor — Classification and external resources Micrograph of a seminoma, a common germ cell tumor. ICD 10 C …   Wikipedia

  • Germ plasm — or polar plasm is a zone found in the cytoplasm of the egg cells of some model organisms (such as Caenorhabditis elegans , Drosophila melanogaster , Xenopus laevis ), which contains determinants that will give rise to the germ cell lineage. As… …   Wikipedia

  • Germ — (j[ e]rm), n. [F. germe, fr. L. germen, germinis, sprout, but, germ. Cf. {Germen}, {Germane}.] 1. (Biol.) That which is to develop a new individual; as, the germ of a fetus, of a plant or flower, and the like; the earliest form under which an… …   The Collaborative International Dictionary of English

  • Germ cell — Germ Germ (j[ e]rm), n. [F. germe, fr. L. germen, germinis, sprout, but, germ. Cf. {Germen}, {Germane}.] 1. (Biol.) That which is to develop a new individual; as, the germ of a fetus, of a plant or flower, and the like; the earliest form under… …   The Collaborative International Dictionary of English

  • Germ gland — Germ Germ (j[ e]rm), n. [F. germe, fr. L. germen, germinis, sprout, but, germ. Cf. {Germen}, {Germane}.] 1. (Biol.) That which is to develop a new individual; as, the germ of a fetus, of a plant or flower, and the like; the earliest form under… …   The Collaborative International Dictionary of English

  • Germ stock — Germ Germ (j[ e]rm), n. [F. germe, fr. L. germen, germinis, sprout, but, germ. Cf. {Germen}, {Germane}.] 1. (Biol.) That which is to develop a new individual; as, the germ of a fetus, of a plant or flower, and the like; the earliest form under… …   The Collaborative International Dictionary of English

  • Germ theory — Germ Germ (j[ e]rm), n. [F. germe, fr. L. germen, germinis, sprout, but, germ. Cf. {Germen}, {Germane}.] 1. (Biol.) That which is to develop a new individual; as, the germ of a fetus, of a plant or flower, and the like; the earliest form under… …   The Collaborative International Dictionary of English

  • germ plasm — n 1) germ cells and their precursors serving as the bearers of heredity and being fundamentally independent of other cells 2) the hereditary material of the germ cells: GENES * * * the substance postulated by 19th century biologists (notably… …   Medical dictionary

  • germ plasma — germ plasm or germ plasma, 1. the germ cells of an organism. 2. the substance, now known to be the chromosomes, in germ cells that transmits hereditary characteristics to the offspring …   Useful english dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”