Stages of Meiosis

Stages of Meiosis

Stages of Meiosis Animation

Premeiotic cells have two copies of each chromosome (2n), one derived from the paternal parent and one from the maternal parent. For simplicity, the paternal and maternal homologs of only one chromosome arediagrammed.

All chromosomes are replicated during the S phase before the first meiotic division, giving a 4n chromosomal complement. Cohesin complexes (not shown) link the sister chromatids composing each replicated chromosome along their full lengths.

As chromosomes condense during the first meiotic prophase, replicated homologs become paired as the result of at least one crossover event between a paternal and a maternal chromatid. This pairing of replicated homologous chromosomes is called synapsis. At metaphase, shown here, both chromatids of one chromosome associate with microtubules emanating from one spindle pole, but each member of a homologous chromosome pair associates with microtubules emanating from opposite poles.

During anaphase of meiosis I, the homologous chromosomes, each consisting of two chromatids, are pulled to opposite spindle poles.

Cytokinesis yields the two daughter cells (now 2n), which enter meiosis II without undergoing DNA replication. At metaphase of meiosis II, shown here, the chromatids composing each replicated chromosome associate with spindle microtubules from opposite spindle poles, as they do in mitosis.

Segregation of chromatids to opposite spindle poles during the second meiotic anaphase followed by cytokinesis generates haploid germ cells (1n) containing one copy of each chromosome (referred to as chromatids earlier).

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    NATtrol Neisseria gonorrhoeae Positive Control Pack

    £686.40
    NATtrol Neisseria gonorrhoeae Positive Control Pack - 6 X 1.25 mL INTENDED USE: NATtrol™ Neisseria gonorrhoeae (NG) Positive Controls (MDZ003) consist of in vitro diagnostic external run controls intended for use with qualitative molecular assays...
    MDZ003 --- NATNG-6MC-IVD
    £686.40
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  • NATtrol Neisseria gonorrhoeae Positive Control

    NATtrol Neisseria gonorrhoeae Positive Control

    £644.07
    NATtrol Neisseria gonorrhoeae Positive Control - 6 X 1 mL INTENDED USE: NATtrol™ CT/NG External Run Controls are qualitative in vitro diagnostic external run controls intended to be used with molecular assays. SUMMARY AND EXPLANATION: NATtrolTM...
    NATNG-6MC
    £644.07
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    £644.07
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  • NATtrol MRSA Positive Control

    NATtrol MRSA Positive Control

    £616.62
      NATtrol™ MRSA/SA External Run Controls* are formulated with purified, intact bacterial cells. The cells have been chemically modified to render them non-infectious and refrigerator stable. Each control pack contains 6 X 0.5 mL of...
    MDZ059 --- NATMRSA-6MC-IVD
    £616.62
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    £616.62
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  • NATtrol Meningitis/Encephalitis

    NATtrol Meningitis/Encephalitis

    £745.89
    NATtrol Meningitis/Encephalitis- ME Controls12 x 0.2 mL PRODUCT DESCRIPTION:  NATtrol™ Meningitis/Encephalitis (ME) Controls* (Qualitative) are formulated with purified, intact bacterial and fungal cells and viral particles. The microorganisms...
    NATMEC-BIO
    £745.89
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  • NATtrol Influenza B Stock

    NATtrol Influenza B Stock

    £1,168.02
    NATtrol™ Influenza B Stock* is formulated with purified, intact viral particles that have been chemically modified to render them non-infectious and refrigerator stable. Each vial contains 1.0 mL of NATtrol™ Influenza B stock in a proprietary...
    NATFLUB-STQ
    £1,168.02
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    £1,168.02
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  • NATtrol Influenza AH3 Stock

    NATtrol Influenza AH3 Stock

    £1,168.02
    NATtrol™ Influenza AH3 Stock* is formulated with purified, intact viral particles that have been chemically modified to render them non-infectious and refrigerator stable. Each vial contains 1.0 mL of NATtrol™ Influenza AH3 stock in a...
    NATFLUAH3-STQ
    £1,168.02
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    £1,168.02
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  • NATtrol Influenza A/B Positive Control NATtrol Influenza A/B Positive Control

    NATtrol Influenza A/B Positive Control

    £512.51
    NATtrol Influenza A/B Positive Control - 6 x 0.5mL PRODUCT DESCRIPTION: NATtrol™ Influenza/RSV External Run Controls (NATFLUAB[1]6C, NATRSV-6C and NATCXVA9-6C)* are formulated with purified, intact virus particles that have been chemically...
    MDZ046 --- NATFLUAB-6C-IVD
    £512.51
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    £512.51
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  • NATtrol Influenza A H1N1pdm Stock | NATFLUAH1(2009)-STQ

    NATtrol Influenza A H1N1pdm Stock | NATFLUAH1(2009)-STQ

    £1,168.02
    NATtrol Influenza A H1N1pdm Stock - Quantitative1 mL PRODUCT DESCRIPTION:NATtrol™ Influenza A H1N1pdm Stock* is formulated with purified, intact viral particles that have been chemically modified to render them non-infectious and refrigerator...
    NATFLUAH1(2009)-STQ
    £1,168.02
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    £1,168.02
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  • NATtrol Influenza A H1 Stock

    NATtrol Influenza A H1 Stock

    £1,168.02
    NATtrol™ Influenza A H1 Stock* is formulated with purified, intact viral particles that have been chemically modified to render them non-infectious and refrigerator stable. Each vialcontains 1.0 mL of NATtrol™ Influenza A H1 stock in a...
    NATFLUAH1-STQ
    £1,168.02
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    £1,168.02
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  • NATtrol HSV 1 & 2 Positive Control

    NATtrol HSV 1 & 2 Positive Control

    £565.14
    NATtrol HSV 1 & 2 Positive Control - 6 x 0.25 mL PRODUCT DESCRIPTION:NATtrol™ HSV 1 & 2 Positive Control (NATHSV-6L)* is formulated with purified, intact viral particles that have been chemically modified to render them non-infectious and...
    NATHSV-6L
    £565.14
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    £565.14
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  • NATtrol GI Controls

    NATtrol GI Controls

    £787.07
    NATtrol™ GI Controls GI Controls (12 x 0.2 mL) #NATGIC-BIO BioFire™ FilmArray® GI Controls PRODUCT DESCRIPTION: NATtrol™ GI Controls (NATGIC-BIO)* are formulated with purified, intact virus partricles and bacterial cells that have...
    NATGIC-BIO
    £787.07
    Qty in Cart: 0
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    £787.07
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