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Mitosis and Meiosis (a 2n = 4 cell)

  • Science
  • Class 9–11
  • 3D model
  • English

Mitosis and Meiosis (a 2n = 4 cell): a 3D model for Class 9–11 Science, covering DNA is copied once, in S phase, before each complete division…, Count chromosomes by centromeres, not by arms or chromatids., Homologous chromosomes are pairs of the same size and genes, one from the mother and one from the father (here orange…, Mitosis: duplicated chromosomes line up one by one at the equator, sister chromatids separate to opposite poles…, Meiosis I: homologues pair up and exchange matching pieces between non-sister chromatids (crossing over)….

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Also called

mitosis · meiosis · cell division · cell cycle · chromosomes · sister chromatids · homologous chromosomes · homologues · crossing over · chiasma · centromere · spindle · S phase · DNA replication · prophase · metaphase · anaphase · telophase · cytokinesis · haploid · diploid · 2n and n · reduction division · gametes

Topics

  • DNA is copied once, in S phase, before each complete division…
  • Count chromosomes by centromeres, not by arms or chromatids.
  • Homologous chromosomes are pairs of the same size and genes, one from the mother and one from the father (here orange…
  • Mitosis: duplicated chromosomes line up one by one at the equator, sister chromatids separate to opposite poles…
  • Meiosis I: homologues pair up and exchange matching pieces between non-sister chromatids (crossing over)…
  • There is no DNA copying between meiosis I and meiosis II.
  • Meiosis II: sister chromatids separate, as in mitosis, giving four haploid cells with n = 2 each…
  • Which homologue goes to which pole is independent for each pair…
  • 2n = 4 is a teaching example; human body cells have 2n = 46.

About this model

A GLB file of about 1520 KB, shown in Lably's 3D viewer and, on a phone, placed in your room with AR. Credit: Model, geometry and animation made for Lably. Stage storyboard informed by the Tactiles tactile models "Mitose" and "Meiose (Meiosis)" by Barbara Henn and "Animal cell that splits open" by Evert Rasing (tactiles.eu, CC BY-SA 4.0); no Tactiles geometry is included in the file. Shared under CC BY-SA 4.0. | CC BY-SA 4.0

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