In 1873, August Weismann postulated the equivalence of the maternal and paternal germ cells for heredity.

The significance of meiosis for reproduction and inheritance, however, was described only in 1890 by German biologist August Weismann, who noted that two cell divisions were necessary to transform one diploid cell into four haploid cells if the number of chromosomes had to be maintained.

The distinction is similar to that proposed by August Weismann, who distinguished between germ plasm ( heredity ) and somatic cells ( the body ).

The Weismann barrier is the principle that hereditary information moves only from genes to body cells, and never in reverse.

If the Weismann barrier is permeable, then genetic treatments of somatic cells may actually result in a heritable change to the genome, possibly resulting in the genetic engineering of the human species rather than just individuals.

Weismann believed that the initial division of the egg into two cells causes determinants to be divided into two groups, such that one cell will develop, say, the left half of the embryo, while the other cell will generate the right half.

Weismann ’ s developmental concept was based on a mistaken interpretation of an 1882 experiment carried about by Wilhelm Roux, in which Roux killed one of the cells of a frog embryo at the two-cell stage.

A sequestered germ line or Weismann barrier is specific to animals, and epigenetic inheritance is expected to be far more common in plants and microbes.

Weismann referred to the chemical carrier of these determinants as the germ plasm, now known to be DNA.

Weismann ’ s view was founded on the belief that biological inheritance is inconceivable except by way of germ plasm from parents to offspring.

The term germ plasm was first used by the German biologist August Weismann ( 1834 – 1914 ).

The question of evolution of sex from asexual reproduction have engaged the attentions of biologists such as Charles Darwin, August Weismann, Ronald Fisher, George C. Williams, John Maynard Smith and W. D. Hamilton, with varied success.

Weismann was born a son of high school teacher Johann ( Jean ) Konrad Weismann ( 1804 – 1880 ), a graduate of ancient languages and theology, and his wife Elise ( 1803 – 1850 ), née Lübbren, the daughter of the county councillor and mayor von Stade, on January 17, 1834 in Frankfurt am Main.

* R. 3rd century: Strunzius ( on Bardesanes, 1710 ), Weismann ( 17l8 ), Mosheim, Kleuker, Schmidt ( Kirchengesch.

* November 5-August Weismann ( born 1834 ), German evolutionary biologist.

* January 17 – August Weismann ( died 1914 ), biologist.

* Weissmann ( disambiguation ), includes Weissman, Weismann

* R. 3rd century: Strunzius ( on Bardesanes, 1710 ), Weismann ( 17l8 ), Mosheim, Kleuker, Schmidt ( Kirchengesch.

This was known even before Mendel by medical men interested in human races ( Wells, Lawrence ), and especially by Weismann.

He reevaluates August Weismann's model of the cell compartmentalization of somatic and germline cell lineages ( see Weismann barrier ), and argues that the vision of the individual taken by the modern synthesis is insufficient to explain the early evolution of development or ontogeny.

* August Weismann ( 1834 – 1914 ), German biologist, evolutionary theorist and proposer of the Weismann barrier

In 1876 he suggested a hypothesis in explanation of heredity, resembling the germplasm theory subsequently elaborated by August Weismann, to the effect that the germinal protoplasm retains its specific properties from generation to generation, dividing in each reproduction into an ontogenetic portion, out of which the individual is built up, and a phylogenetic portion, which is reserved to form the reproductive material of the mature offspring.

The term Darwinism had covered a wide range of ideas, many of which differed from Darwin's views, but it became associated with the minority view of August Weismann who went further than Darwin by rejecting inheritance of acquired characters and attributing all evolution to natural selection, a view also called neo-Darwinism.

Commercial brewing at its location began in 1681 when Michael Weismann purchased the property from the Monastery of Kremsmünster.

* UCLA DIS 245 " Info Access " Wiki on Reference Services, edited by John V. Richardson Jr. and Debbie Weismann

As part of the disagreement about whether natural selection alone was sufficient to explain speciation, George Romanes coined the term neo-Darwinism to refer to the version of evolution advocated by Alfred Russel Wallace and August Weismann with its heavy dependence on natural selection.

Immediately after university, Weismann took on a post as assistant at the Städtische Klinik ( city clinic ) in Rostock.

After this work, Weismann accepts evolution as a fact on a par with the fundamental assumptions of astronomy ( e. g. Heliocentrism ).

As part of the disagreement about whether natural selection alone was sufficient to explain speciation, George Romanes coined the term neo-Darwinism to refer to the version of evolution advocated by Alfred Russel Wallace and August Weismann with its heavy dependence on natural selection.

Huxley was the most important biologist after August Weismann to insist on natural selection as the primary agent in evolution.

After Huxley the most important influence on his thought was August Weismann, the German zoologist who rejected Lamarkism, and wholeheartedly advocated natural selection as the key force in evolution at a time when other biologists had doubts.

" On the assumption that behavior cannot affect genes, Weismann argued that only genetic mutation, not adaptations on the part of a struggling organism, could significantly alter the developmental patterns inherited by progeny.

For instance, Ilya Weismann, deputy director of competing beverage company Baltic, was assassinated on January 10, 2000.

Sally Durant Plummer, " blond, petite, sweet-faced " and at 49 " still remarkably like the girl she was thirty years ago ", a former Weismann girl is the first guest to arrive ; her ghostly youthful counterpart moves towards her.

Former Weismann performers at the reunion include Max and Stella Deems, who lost their radio jobs and became store owners in Miami ; Solange La Fitte, a coquette, who is still vibrant three decades later ; Hattie Walker, who has outlived five younger husbands ; Vincent and Vanessa, former dancers who now own an Arthur Murray franchise ; Heidi Schiller, for whom Franz Lehár once wrote a waltz ( or was it Oscar Straus?

Suddenly, at the peak of madness and confusion, the couples are engulfed by their follies, which transform the rundown theatre into a fantastical " Loveland ", an extravaganza even more grand and opulent than the gaudiest Weismann confection: " the place where lovers are always young and beautiful, and everyone lives only for love ".

Weismann became the Director of the Zoological Institute and the first Professor of Zoology at Freiburg.

Weismann serves as chairman of the Great Books Academy ( over 3000 students ) and is a Fellow at the Adler-Aquinas Institute.

* An examination of Weismannism ( 1893 ) ( August Weismann was the leading evolutionary theoretician at the turn of the 19th century )

He began to study medicine in 1886 under August Weismann at the University of Freiburg.

On the soon-to-be demolished stage of the Weismann Theatre, a reunion is being held to honor Weismann's " Follies " shows past, and the beautiful chorus girls who once performed there.