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Preliminary Objectives - Chapter 7, Part I

Terms in this set (13)

Prophase: condensation of chromosomes; spindle assembly

Pro-metaphase: Nuclear envelope breakdown; chromosome attachment to spindle

Metaphase: Alignment of chromosomes at equatorial plate

Anaphase: Separation of chromatids; migration to poles

Telophase: Chromosomes de-condense; nuclear envelope reforms

Cytokinesis: Cell separation; cell membrane and/or cell wall formation

Meiosis I

Early Prophase I: The chromatin begins to condense following interphase.

Mid-Prophase I: Synapsis aligns homologs, and chromosomes condense further

Pro-metaphase I: The chromosomes continue to coil and shorten. The chiasmata reflect crossing over, the exchange of genetic material b/w non sister chromatids in a homologous pair. The nuclear envelope breaks down

Metaphase I: The homologous pairs line up on the equatorial (metaphase) plate

Anaphase I: The homologous chromosomes (each w/ 2 chromatids) move to opposite poles of the cell

Telophase I: The chromosomes gather into nuclei, and the original cell divides

Meiosis II

Prophase II: The chromosomes condense again, following
a brief interphase (interkinesis) in which DNA does not replicate

Metaphase II: The centromeres of the paired chromatids line up across the equatorial plates of each cell

Anaphase II: The chromatids finally separate, becoming chromosomes in their own right, and are pulled to opposite poles. Because of crossing over and independent assortment, each cell will have a genetic makeup

Telophase II: The chromosomes gather into nuclei, and the cells divide

Outcome: Each of the four cells has a nucleus w/ a haploid # of chromosomes