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).

  • Product
  • Qty in Cart
  • Quantity
  • Price
  • Subtotal
  • NATtrol Flu/RSV/SARS-CoV-2 Positive Control

    NATtrol Flu/RSV/SARS-CoV-2 Positive Control

    €618.80
    NATtrol Flu/RSV/SARS-CoV-2 Positive Control - 6 x 0.5 mL PRODUCT DESCRIPTION: NATtrol™ Flu/RSV/SARS-CoV-2 External Run Controls* (NATFRC-6C (Positive Control) and NATCV9-6C (Negative Control)) are formulated with purified, intact viral particles...
    NATFRC-6C
    €618.80
    Qty in Cart: 0
    Quantity:
    Price:
    €618.80
    Subtotal:
  • NATtrol Flu/RSV/SARS-CoV-2 Negative Control

    NATtrol Flu/RSV/SARS-CoV-2 Negative Control

    €574.60
    NATtrol Flu/RSV/SARS-CoV-2 Negative Control - 6 x 0.5mL PRODUCT DESCRIPTION: NATtrol™ Flu/RSV/SARS-CoV-2 External Run Controls* (NATFRC-6C (Positive Control) and NATCV9-6C (Negative Control)) are formulated with purified, intact viral particles...
    NATCV9-6C
    €574.60
    Qty in Cart: 0
    Quantity:
    Price:
    €574.60
    Subtotal:
  • NATtrol Flu Verification Panel

    NATtrol Flu Verification Panel

    €812.50
    NATtrol™ Flu Verification Panel Flu Verification Panel (7 X 0.5 mL) Abbott ID NOW™ Flu Verification Panel Luminex® VERIGENE® Flu Verification Panel Roche cobas ® Liat® Flu Verification Panel Catalog Number:...
    NATFVP-NNS
    €812.50
    Qty in Cart: 0
    Quantity:
    Price:
    €812.50
    Subtotal:
  • NATtrol EV Panel

    NATtrol EV Panel

    €1,107.60
    NATtrol EV Panel - 20 X 0.2 mL PRODUCT DESCRIPTION: NATtrol™ Enterovirus (EV) Panel (NATEVP-C)* is formulated with purified, intact virus particles that have been chemically modified to render them non-infectious and refrigerator stable. NATEVP-C...
    NATEVP-C
    €1,107.60
    Qty in Cart: 0
    Quantity:
    Price:
    €1,107.60
    Subtotal:
  • NATtrol CT/NG Negative Control Pack

    NATtrol CT/NG Negative Control Pack

    €607.10
    NATtrol CT/NG Negative Control Pack - 6 X 1.25 mL INTENDED USE:  The NATtrol™ Chlamydia trachomatis/Neisseria gonorrhoeae (CT/NG) Negative Control is an unassayed in vitro diagnostic external run control intended to be used with qualitative...
    MDZ004 --- NATCT/NGNEG-6MC-IVD
    €607.10
    Qty in Cart: 0
    Quantity:
    Price:
    €607.10
    Subtotal:
  • NATtrol CT/NG Negative Control

    NATtrol CT/NG Negative Control

    €581.10
    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 Chlamydia trachomatis (CT) Positive Control and NATtrol™ Neisseria...
    NATCT/NGNEG-6MC
    €581.10
    Qty in Cart: 0
    Quantity:
    Price:
    €581.10
    Subtotal:
  • NATtrol Clostridium difficile NAP1, External Run Control, Medium

    NATtrol Clostridium difficile NAP1, External Run Control, Medium

    €976.30
    NATtrol Clostridium difficile NAP1, External Run Control - Medium - 6 X 1 mL  
    NATCDI(NAP1)-ERCM
    €976.30
    Qty in Cart: 0
    Quantity:
    Price:
    €976.30
    Subtotal:
  • NATtrol Clostridium difficile NAP1, External Run Control, Low

    NATtrol Clostridium difficile NAP1, External Run Control, Low

    €837.20
    NATtrol Clostridium difficile NAP1 External Run Control - Low - 6 X 1 mL  
    NATCDI(NAP1)-ERCL
    €837.20
    Qty in Cart: 0
    Quantity:
    Price:
    €837.20
    Subtotal:
  • NATtrol Chlamydia trachomatis serotype D, External Run Control, Medium

    NATtrol Chlamydia trachomatis serotype D, External Run Control, Medium

    €837.20
    NATtrol Chlamydia trachomatis serotype D, External Run Control - Medium - 6 X 1mL. PRODUCT DESCRIPTION: NATtrol™ Chlamydia trachomatis External Run Controls (NATCT(D-UW3)-ERCL and NATCT(D-UW3)-ERCM)* are formulated with purified, intact bacterial...
    NATCT(D-UW3)-ERCM
    €837.20
    Qty in Cart: 0
    Quantity:
    Price:
    €837.20
    Subtotal:
  • NATtrol Chlamydia trachomatis serotype D, External Run Control, Low

    NATtrol Chlamydia trachomatis serotype D, External Run Control, Low

    €746.20
    NATtrol Chlamydia trachomatis serotype D, External Run Control - Low- 6 X 1 mL PRODUCT DESCRIPTION: NATtrol™ Chlamydia trachomatis External Run Controls (NATCT(D-UW3)-ERCL and NATCT(D-UW3)-ERCM)* are formulated with purified, intact bacterial...
    NATCT(D-UW3)-ERCL
    €746.20
    Qty in Cart: 0
    Quantity:
    Price:
    €746.20
    Subtotal:
  • NATtrol Chlamydia trachomatis Positive Control Pack

    NATtrol Chlamydia trachomatis Positive Control Pack RUO

    €780.00
    NATtrol Chlamydia trachomatis Positive Control Pack - 6 X 1.25 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...
    MDZ002 --- NATCT(434)-6MC
    €780.00
    Qty in Cart: 0
    Quantity:
    Price:
    €780.00
    Subtotal:
  • NATtrol Chlamydia trachomatis Positive Control

    NATtrol Chlamydia trachomatis Positive Control

    €731.90
    NATtrol Chlamydia trachomatis 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...
    NATCT(434)-6MC
    €731.90
    Qty in Cart: 0
    Quantity:
    Price:
    €731.90
    Subtotal:
  • NATtrol Chlamydia trachomatis LGV II 434, External Run Control, Medium

    NATtrol Chlamydia trachomatis LGV II 434, External Run Control, Medium

    €837.20
    NATtrol Chlamydia trachomatis LGV II 434, External Run Control - Medium- 6X1mL  
    NATCT(434)-ERCM
    €837.20
    Qty in Cart: 0
    Quantity:
    Price:
    €837.20
    Subtotal:
  • NATtrol Chlamydia trachomatis LGV II 434, External Run Control, Low

    NATtrol Chlamydia trachomatis LGV II 434, External Run Control, Low

    €746.20
    NATtrol Chlamydia trachomatis LGV II 434, External Run Control - Low - 6 X 1 mL  
    NATCT(434)-ERCL
    €746.20
    Qty in Cart: 0
    Quantity:
    Price:
    €746.20
    Subtotal:
  • NATtrol CARBA-R Verification Panel

    NATtrol CARBA-R Verification Panel

    €637.00
    NATtrol CARBA-R Verification Panel - 10 x 0.06 mL PRODUCT DESCRIPTION: NATtrol™ CARBA-R Verification Panel* (qualitative) is formulated with purified, intact bacterial cells. The microorganisms have been chemically modified to render them...
    NATCRVP-C
    €637.00
    Qty in Cart: 0
    Quantity:
    Price:
    €637.00
    Subtotal:
  • NATtrol BCID2 Panel NATtrol BCID2 Panel

    NATtrol BCID2 Panel

    €1,751.10
    NATtrol™ Blood Culture Identification 2 (BCID2) Panel BCID2 Panel (35 x 0.2mL) BioFire™ FilmArray® BCID2 Panel Catalog Number: NATBCP2-BIO   PRODUCT DESCRIPTION: NATtrol™ Blood Culture Identification 2 (BCID2) Panel* is...
    NATBCP2-BIO
    €1,751.10
    Qty in Cart: 0
    Quantity:
    Price:
    €1,751.10
    Subtotal:
  • NATtrol BCID Panel NATtrol BCID Panel

    NATtrol BCID Verification Panel

    €1,562.60
    NATtrol™ Blood Culture Identification Panel BCID Panel (23 x 0.2mL) BioFire™ FilmArray® BCID Panel Catalog Number: NATBCP-BIO   PRODUCT DESCRIPTION: NATtrol™ Blood Culture Identification Panel (NATBCP-BIO)* is formulated with...
    NATBCP-BIO
    €1,562.60
    Qty in Cart: 0
    Quantity:
    Price:
    €1,562.60
    Subtotal:
  • NATtrol B. pertussis B. parapertussis Positive Control NATtrol

    NATtrol B. pertussis/parapertussis Positive Control

    €642.20
    NATtrol™ Bordetella pertussis/parapertussis Positive Control (NATBRD-6L)* is formulated with purified, intact bacterial cells that have been chemically modified to render them non-infectious and refrigerator stable. Each control pack contains 6 x 0...
    NATBRD-6L
    €642.20
    Qty in Cart: 0
    Quantity:
    Price:
    €642.20
    Subtotal:
  • NATtrol AdV/hMPV/HRV Control

    NATtrol AdV/hMPV/HRV Control

    €588.90
    NATtrol AdV/hMPV/HRV Control - 6 X 0.5mL PRODUCT DESCRIPTION:  NATtrol™ AdV/hMPV/HRV Control* is formulated with purified, intact viral particles that have been chemically modified to render them non[1]infectious and refrigerator stable. Each...
    NATAMR-ERC
    €588.90
    Qty in Cart: 0
    Quantity:
    Price:
    €588.90
    Subtotal:
  • Influenza Rapid Test Verificaiton Panel

    Influenza Rapid Test Verification Panel

    €657.80
    Influenza Rapid Test Verification Panel I Influenza Rapid Test Verification Panel (20 X 0.5 mL) Abbott ID NOW™ Influenza Rapid Test Verification Panel Quidel® Sofia® Influenza Rapid Test Verification Panel Part Number: KZMC021   NAME...
    KZMC021
    €657.80
    Qty in Cart: 0
    Quantity:
    Price:
    €657.80
    Subtotal:
  • Total: items /

Adding your products to cart