Describe the key events occurring during Anaphase I, Telophase I, and Cytokinesis of Meiosis I, and the general purpose of Meiosis II.

The image describes the stages of Meiosis I and the introduction to Meiosis II, focusing on the chromosomal basis of inheritance.

Here's a summary of the key points from the provided text:

• Meiosis I: Anaphase I

  • Spindle fibers pull homologous chromosomes apart.
  • Sister chromatids remain attached at the centromere.
  • Chiasma connections break, allowing homologous chromosomes to separate.

• Meiosis I: Telophase I

  • Separated chromosomes arrive at opposite poles.
  • Chromosomes decondense, and nuclear envelopes reform around the chromatids.

• Meiosis I: Cytokinesis

  • This is the physical separation of the cytoplasm into two daughter cells, either by a cleavage furrow or a cell plate.
  • Each pole receives one member of each pair of homologous chromosomes.
  • Each resulting cell is haploid (has half the set of chromosomal pairs) but still contains duplicated chromatids.
  • The chromatid pairs are not identical due to crossing over in prophase I.

• Meiosis II

  • The remaining connected sister chromatids in the haploid cells from Meiosis I will be split to form four haploid cells.
  • In some species, cells undergo interkinesis/interphase II before entering Meiosis II.