منابع مشابه
Meiosis
Why should a biologist care about rheology? Actually, biologists used to care a lot more about rheology than they have lately. A prominent physiology text from the 1950s (An outline of general physiology by L. Heilbrunn) stated that “In any attempt to interpret the machinery of a living cell, it is essential to know something about the mechanical properties of the protoplasm in the cell that is...
متن کاملMeiosis.
Sexual reproduction requires the production of haploid gametes (sperm and egg) with only one copy of each chromosome; fertilization then restores the diploid chromosome content in the next generation. This reduction in genetic content is accomplished during a specialized cell division called meiosis, in which two rounds of chromosome segregation follow a single round of DNA replication. In prep...
متن کاملMeiosis: How Male Flies Do Meiosis
In meiosis in male fruitflies, chromosome pairing events do not facilitate genetic exchange, but rather create bivalents that can be sequestered to discrete pockets of the prophase nucleus. This assignment of homologs to a common pocket likely facilitates the orientation of homologous centromeres to opposite poles.
متن کاملMeiosis in perspective
Our understanding of meiosis springs from two suggestions made by Weismann in 1887. One was that meiosis would be found to compensate for fertilization in the life cycles of both sexes and all organisms. The other was that the development of sexual reproduction in evolution depended on the value of meiosis in exposing the results of genetic recombination to natural selection. In confirming thes...
متن کاملMeiosis in Humans
Meiosis, the process by which sexually reproducing organisms generate gametes (sex cells), is an essential precondition for the normal formation of the embryo. As sexually-reproducing, diploid, multicellular eukaryotes, humans [5] rely on meiosis [6] to serve a number of important functions, including the promotion of genetic diversity and the creation of proper conditions for reproductive succ...
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ژورنال
عنوان ژورنال: CYTOLOGIA
سال: 1936
ISSN: 0011-4545,1348-7019
DOI: 10.1508/cytologia.7.23