Apedia

A-Level Biology OCR A

Chromatids Entangled A1 Anaphase Homologous Chromosomes Pulled Opposite

This note describes Anaphase 1 of meiosis, where homologous chromosomes are pulled to opposite poles, and clarifies that crossing over occurs at chiasmata, leading to recombinant chromatids.

Anaphase 1: Homologous chromosomes separate to opposite poles; crossing over sites (chiasmata) break and rejoin.

Front What happens at A1?
Back Anaphase 1:
  • Homologous chromosomes are pulled to opposite poles and chromatids stay joined to each other
  • Entangled sections of DNA on non-sister chromatids that became entangled during crossing over break off and rejoin at chiasmata, resulting in formation of recombinant chromatids

Learn with these flashcards. Click next, previous, or up to navigate to more flashcards for this subject.

Next card: Chromosomes t1 telophase assemble pole nuclear membrane reforms

Previous card: Metaphase m1 homologous pairs assemble plate independent assortment

Up to card list: A-Level Biology OCR A