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(22.) How many bivalents are seen in zygotene when somatic/diploid cel

(22.) How many bivalents are seen in zygotene when somatic/diploid cell has 20 chromosome?

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प्ट 10.4.1 Melosis I more complex when compared to prophase of mitosis. It has been further subdivided into the following five phases based on chromosomal behaviour, i.e., Leptotene, Zygotene, Pachytene, Diplotene and Diakinesis. the chrompaction of chromosomes continues under the light microscope. The compaction of chromose stage of prophase throughout leptotene. This is followed by the second stage of propharing together Hिला called zygotene. During this stage chromosomes start pairing togethered हबताchromosomes are called homologous chromosomes. Electron micrographs of this stage indicate that chromosome synapsis is Domaccompanied by the formation of complex structure called synaptonemal complex, The complex formed by a pair of synapsec thomologous chromosomes is called a bivalent or a tetrad. However these are more clearly visible at the next stage. The first two stages 0 prophase I are relatively short-lived compared to the next stage that i pachytene. During this stage, the four chromatids of each bivaler chromosomes becomes distinct and clearly appears as tetrads. This stag is characterisèd by the appearance of recombination nodules, the site |or at which crossing over occurs between non-sister chromatids of th homologous chromosomes. Crossing over is the exchange of genet material between two homologous chromosomes. Crossing over is al f. - an enzyme-mediated process and the enzyme involved is call recombinase. Crossing over leads to recombination of genetic mater on the two chromosomes. Recombination between homologo chromosomes is completed by the end of pachytene, leaving chromosomes linked at the sites of crossing over. The beginning of diplotene is recognised by the dissolution of synaptonemal complex and the tendency of the recombir homologous chromosomes of the bivalents to separate from each of except at the sites of crossovers. These -shaped structures, are ca chiasmata. In oocytes of some vertebrates. diplotene can last months or years. The final stage of meiotic prophase is diakinesis. This is marke terminalisation of chiasmata. During this phase the chromosome fully condensed and the meiotic spindle is assembled to prepare homologous chromosomes for separation. By the end of diakinesis nucleolus disappears and the nuclear envelope also breans d Diakinesis represents transition to metaphase.
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Question Text
(22.) How many bivalents are seen in zygotene when somatic/diploid cell has 20 chromosome?
Updated OnAug 24, 2022
TopicCell: Structure and Functions
SubjectBiology
ClassClass 11
Answer Type Video solution: 1
Upvotes103
Avg. Video Duration7 min