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Lampbrush chromosome. Lampbrush chromosome are a special form of chromosome found in the growing oocytes (immature eggs) of most animals, except mammals. They were first described by Walther Flemming and Ruckert in 1882. [1] Lampbrush chromosomes of tailed and tailless amphibians, birds and insects are described best of all.
Joseph Grafton Gall (April 14, 1928 – September 12, 2024) was an American cell biologist whose studies revealed many details of chromosome structure and function. Gall's studies were greatly facilitated by his knowledge of many different organisms because he could select the most favorable organism to study when approaching a specific question about nuclear structure.
The Charles E. Smith Jewish Day School, often referred to as CESJDS or JDS, is a private, pluralistic Jewish JK-12 school located on two campuses in North Bethesda (Rockville postal address), Maryland, United States. [4] [5] Founded in 1966, the school's namesake is Charles E. Smith, [6] a local Jewish philanthropist and real estate magnate.
Lampbrush chromosome from the cell nucleus of an ovarial egg from Triton sp., a salamander. Harold Garnet Callan FRS FRSE (15 March 1917, in Maidenhead – 3 November 1993), [1] known as Mick Callan, was an English zoologist and cytologist. [2] He is especially remembered for his work on Lampbrush chromosomes.
Although found all across the lampbrush chromosome, they are not organized in a clear pattern along as they are in normal pachytene chromosomes of meiosis. [ 2 ] [ 5 ] The two sister chromatids of a lampbrush chromosome separate fully, forming lateral loops that extend from chromomeres, and act as transcription complexes.
1959: Y chromosome discovery. Liane Brauch "Lee" Russell (August 27, 1923 – July 20, 2019) was an Austrian-born American geneticist and conservationist.Her studies in mammalian genetics provided the basis for understanding the chromosomic basis for sex determination in mammals and the effects occasioned by radiation, drugs, fuels and waste on mice. [1]
The first Jewish day school in North America was established in 1731 at the Congregation Shearith Israel. German Jewish immigrants who arrived in the 19th century establish day schools in their own communities, but this movement to establish Jewish day schools had lost momentum by the 1870s. [5]
Hermann Joseph Muller (December 21, 1890 – April 5, 1967) was an American geneticist who was awarded the 1946 Nobel Prize in Physiology or Medicine, "for the discovery that mutations can be induced by X-rays". [2]