Basic meiosis question

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    • #11038
      dae
      Participant

      In metaphase I can both of the chromatids of a double chromosome crossover? In textbooks the tetrad complex is always shown laid flat (it looks like XX ) so it makes since that only one chromatid from each double chromosome would be able to recombine in that geometry. But if this is a simplification for the sake of 2D display and the tetrad complex can actually assemble so that one double chromosome lays on top of the other (I can think of any reason they couldn’t) than it makes sense that both chromatids could cross over.

      Does anyone know the actual geometry of metaphase I?

      Thanks!

    • #89578
      plasmodesmata11
      Participant

      The chromosomes do synapse as if the X’s were on top of each other. I guess in your book the diagrams are simplified.

    • #89582
      MrMistery
      Participant

      during a crossover 2,3 or 4 strands can cross over.
      See the figures in this book http://books.google.com/books?id=3E_0H6 … #PPA193,M1

    • #89584
      dae
      Participant

      Thanks! that makes way more sense 🙂

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