
	Where results make sense

Topic: Germ plasm theory

	GERM PLASM : Comprehensive Encyclopedia (Site not responding. Last check: 2007-10-31)
		The 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.
		The German biologist August Weismann formulated the now discredited germ plasm theory in the 1890s, in which he stated that the germ plasm was the essential nuclear part of germ cells, that it remained qualitatively unchanged from the zygote (in contrast with somatic cells) and was responsible for heredity.
		In other words it states that a genes determination was sealed as it, and each of its progeny received fewer and fewer genes from what he called the "germ plasm." (That there is only a set "amount" of "germ plasm" (what we know as genes) and that it was gradually divided amongst the offspring).
	bibleproupdate2.com /Definitions/Germ_plasm (220 words)

	Evolutionary theories of aging and longevity
		Evolutionary theories of aging and longevity are those theories that try to explain the remarkable differences in observed aging rates and longevity records across different biological species (compare, for example, mice and humans) through interplay between the processes of mutation and selection.
		Darwin's theory is based on the idea of random and heritable variation of biological traits between individuals (caused by mutations) with subsequent natural selection for preferential reproduction of those individuals who are particularly fit to a given environment.
		This was also admitted by the authors of the disposable soma theory themselves: “The disposable soma theory is, in a sense, a special case of Williams's (1957) pleiotropic gene hypothesis [antagonistic pleiotropy theory], the gene in question controlling the switch to reduced accuracy in somatic cells.
	www.longevity-science.org /Evolution.htm (8834 words)

	heredity
		the popular concept of heredity was the theory of preformation: that the prototypical members of each organism (e.g., Adam and Eve among humans) contained within them all future generations, perfectly formed but in miniature, arranged one inside the next like a series of Chinese boxes.
		The theory of pangenesis, as it was termed in a modified version in
		August Weismann's theory of germ plasm continuity (1892) established that the germ (sex) cells are set apart from other body cells early in embryonic development and thus that only changes in the germ plasm, and not influences on the adult body, can affect the characteristics of future generations.
	www.factmonster.com /ce6/sci/A0823469.html (427 words)

	August Weismann (Site not responding. Last check: 2007-10-31)
		He taught zoology at the Univ. of Freiburg from 1866 to 1912.
		He is known as the originator of the germ-plasm theory of
		His doctrine, formerly called Weismannism, stresses the unbroken continuity of the germ plasm and the nonheritability of acquired characteristics.
	www.infoplease.com /id/A0851789 (134 words)

Try your search on: Qwika (all wikis)