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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.
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. The lateral loops are ...
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.
Chromosome 1A has a large duplication of regions labeled 6–8, accompanied by a small deletion of region 3. In contrast, chromosome 1B has a large deletion of regions 6–8 with a duplication of a small region 3 (such deletions in a monozygotic state would be lethal). In the form of lampbrush chromosomes, they create a different number of ...
An oocyte (/ ˈ oʊ ə s aɪ t /, oöcyte, or ovocyte is a female gametocyte or germ cell involved in reproduction.In other words, it is an immature ovum, or egg cell.An oocyte is produced in a female fetus in the ovary during female gametogenesis.
This is an accepted version of this page This is the latest accepted revision, reviewed on 23 January 2025. DNA molecule containing genetic material of a cell This article is about the DNA molecule. For the genetic algorithm, see Chromosome (genetic algorithm). Chromosome (10 7 - 10 10 bp) DNA Gene (10 3 - 10 6 bp) Function A chromosome and its packaged long strand of DNA unraveled. The DNA's ...
Micropia is the name of a family of LTR retrotransposons widespread in the genomes of fruitflies of the genus Drosophila. [1] [2] Micropia retrotransposons in some species of Drosophila express a male germline-specific and meiotic-specific antisense transcript complementary to the reverse transcriptase (RT) and ribonuclease A (RNaseA) genes of the proviral retrotransposon. [3]