Download PDF by Bernard John: Meiosis (Developmental and Cell Biology Series)

By Bernard John

ISBN-10: 0521017521

ISBN-13: 9780521017527

ISBN-10: 0521350530

ISBN-13: 9780521350532

This can be the 1st entire evaluation and dialogue of meiosis, the antithesis of fertilization. Meiosis is a unique type of nuclear department "invented" through sexually reproducing eukaryotes to make sure that an accurate chromosome supplement is maintained over successive generations. during this masterly remedy, the writer describes the scheduling, mechanisms, biochemistry and the genetic keep an eye on of the occasions of meiosis in sexual platforms in addition to the variations followed by way of subsexual kinds. it will be a necessary textual content for top department scholars and learn employees in genetics, cytology and mobilephone biology.

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Extra resources for Meiosis (Developmental and Cell Biology Series)

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2). Moreover, DNA replication precedes not one, but two, successive sequences of chromosome movement and nuclear division and is also disengaged from histone synthesis. The first of these sequences {meiosis-1) involves a prolonged prophase with a series of substages whose names reflect the morphological appearance of the chromosomes within the nucleus. Here, the individual chromosomes which are present at the onset of meiosis (leptotene, from the greek leptos for fine and tene for thread) are not the units of orientation and movement since, in a diploid (2x) species, homologous chromosomes undergo parallel pairing or synapsis (zygotene, from the greek zygon for coupled) to form a haploid (x) number of bivalents.

B), reduction can be avoided by the suppression of the second meiotic division. In sum, the two successive nuclear divisions that constitute a meiosis partition the four chromatids of each bivalent, one to each of the four haploid nuclei, which Chiasmate meiosis 45 ft Fig. 13. The influence of mini B-chromosomes (arrowed) on male meiotic cytokinesis in the grasshopper Buforania sp. , XO). Individuals of this species may carry from 1-5 small additional or supernumerary chromosomes. The pachytene meiocyte (a) illustrated has three, while the metaphase-1 meiocyte (b) has five.

The X univalent has now straightened out and at diakinesis can be seen to consist of two chromatids. 1). This differential contraction is, however, subsequently resolved and the two categories of chromatin become isopycnotic and indistinguishable. Following pachytene condensation, homologues separate from one another. Initially the separation of homologues occurs in the same plane as they came together at synapsis. Despite this separation, they retain an association at one or more sites where two of the four chromatids in each bivalent, one from each homologue, form an X-shaped, criss-cross, arrangement referred to as a chiasma (from the greek word cross; plural chiasmata).

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Meiosis (Developmental and Cell Biology Series) by Bernard John

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