STAGES OF MEIOSIS Chapter 10 Chromosomes become visible

STAGES OF MEIOSIS Chapter 10

Chromosomes become visible. Nuclear envelope breaks down. Crossing-over occurs. Centrioles Nuclear envelope Spindle fibers Centromeres Chromosome s PROPHASE I

Pairs of homologous chromosomes move to the equator of the cell. Crossing over is complete Centrioles Spindle fibers Equator Chromosome s METAPHASE I

Homologous chromosomes move to opposite poles of the cell. The cell begins lengthening Poles Centrioles Spindle fibers Chromosome s ANAPHASE I

The chromosomes reach the poles. At each pole, now, there is a complete haploid set of chromosomes. By the end of this stage the cell has divided into two cells. This separation of the cytoplasm is called cytokinesis. Centrioles Cleavage Furrow Chromosome s TELOPHASE I AND CYTOKINESIS

Prophase II begins with the two daughter cells produced by the first meiotic division. A new spindle forms around the chromosomes. Centrioles Spindle Fibers PROPHASE II Chromosome s

Chromosomes line up at the equator Centrioles Centromeres Spindle Fibers METAPHASE II Spindle Fibers Chromosome s

Centromeres divide. The sister chromatids of each chromosome separate and move toward opposite poles. Centrioles Centromeres Spindle Fibers Chromosome s ANAPHASE II

The chromosomes reach opposite poles, cytokinesis occurs, the two cells produced by meiosis I divide to form four haploid daughter cells, and nuclear envelopes form. Meiosis is now complete. Nuclear Envelope Centrioles Centromeres Chromosome s TELOPHASE II AND CYTOKINSIS

� Page 142 in book. SUMMARY