HUMAN BIOLOGY

CeLL reprOduCtIOn 369

Anaphase

• Sister chromatids sepa-
  rate and move toward
  opposite spindle poles.

Metaphase

• Chromosomes align
  midway between
  spindle poles.

Prophase

• Chromosomes condense.


• Spindle forms and attaches
  chromosomes to spindle poles.


• Nuclear envelope breaks up.

Telophase

• Chromosome clusters arrive
  at spindle poles.


• New nuclear envelopes form.


• Chromosomes decondense.

Anaphase I

• Homologous chromosomes
  separate and move toward
  opposite spindle poles.

Metaphase I

• Chromosomes align
  midway between
  spindle poles.

Prophase I

• Chromosomes condense.


• Homologous chromosomes pair.


• Crossovers occur (not shown).


• Spindle forms and attaches
  chromosomes to spindle poles.


• Nuclear envelope breaks up.

Telophase I

• Chromosome clusters arrive
  at spindle poles.


• New nuclear envelopes form.


• Chromosomes decondense.

Anaphase II

• Sister chromatids sepa-
  rate and move toward
  opposite spindle poles.

Metaphase II

• Chromosomes align
  midway between
  spindle poles.

Prophase II

• Chromosomes condense.


• Spindle forms and attaches
  chromosomes to spindle poles.


• Nuclear envelope breaks up.

Telophase II

• Chromosome clusters arrive
  at spindle poles.


• New nuclear envelopes form.


• Chromosomes decondense.

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