Events of Interphase

• Chromosomes (uncondensed in this phase) replicate in preparation for meiosis.
• Nuclear membrane breaks down.
• Homologues move toward the center of the cell and line up.
• Homologues separate and are pulled to opposite poles.

1.

• Homologous pairs of sister chromatids come together and cross over.
• Spindle forms.
• Nuclear membrane breaks down.
• Replicated chromosomes condense.

2.

• Homologous pairs of sister chromatids come together and cross over.
• Spindle forms.
• Nuclear membrane breaks down.
• Replicated chromosomes condense.

3.

• Homologous pairs of sister chromatids come together and cross over.
• Spindle forms.
• Nuclear membrane breaks down.
• Replicated chromosomes condense.

4.

• Homologous pairs of sister chromatids come together and cross over.
• Spindle forms.
• Nuclear membrane breaks down.
• Replicated chromosomes condense.

Events of Metaphase I

• Sister chromatids (replicated chromosomes) condense.
• The cell pinches into two daughter cells.
• Homologues move toward the center of the cell and line up.
• Nuclear membrane breaks down.

Events of Anaphase I

• Homologues move toward the center of the cell and line up.
• Homologues separate and are pulled to opposite poles.
• Spindle forms.
• Nuclear membrane breaks down.

1.

• Chromosomes may unwind slightly.
• Sister chromatids arrive at the cell poles and the nuclear membrane reassembles around them.
• Nuclear membrane breaks down.
• The cell pinches into two daughter cells.

2.

• Chromosomes may unwind slightly.
• Sister chromatids arrive at the cell poles and the nuclear membrane reassembles around them.
• Nuclear membrane breaks down.
• The cell pinches into two daughter cells.

3.

• Chromosomes may unwind slightly.
• Sister chromatids arrive at the cell poles and the nuclear membrane reassembles around them.
• Nuclear membrane breaks down.
• The cell pinches into two daughter cells.

1.

• The nuclear membrane reassembles around the chromosomes.
• Chromosomes in daughter cells condense.
• Homologues separate and are pulled to opposite poles.
• Spindle forms.

2.

• The nuclear membrane reassembles around the chromosomes.
• Chromosomes in daughter cells condense.
• Homologues separate and are pulled to opposite poles.
• Spindle forms.

Events of Metaphase II

• Spindle forms.
• The cell pinches into two daughter cells.
• Sister chromatid pairs line up at the center of the cell.
• Sister chromatids are pulled apart by the spindle fibers toward opposite cell poles.

Events of Anaphase II

• The cell pinches into two daughter cells.
• Sister chromatids are pulled apart by the spindle fibers toward opposite cell poles.
• Chromosomes may unwind slightly.
• Homologues separate and are pulled to opposite poles.

1.

• Nuclear membrane breaks down.
• The two daughter cells pinch into four haploid daughter cells.
• Spindle forms.
• The nuclear membrane reassembles around the chromosomes.

2.

• Nuclear membrane breaks down.
• The two daughter cells pinch into four haploid daughter cells.
• Spindle forms.
• The nuclear membrane reassembles around the chromosomes.