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12 Cards in this Set

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What is the first of the two key outcomes of Mieosis?
1) Reduction Division

A form of cell division that produces daughter cells with fewer chromosomes than the parent cells.
What is the second outcome of Meiosis?
2)Recombination

Products of meiosis have different combinations of genes. Genetic variation
What is the special form of cell division occuring only in the reproductive tissues of sexually reproducing organisms where n(haploid) gametes are formed, having half of the DNA contents of the original sex-forming cells
Mieosis
During this division, the chromosome numbers are reduced from 2n to 'n'
Mieosis 1, reduction division
What phase of Mieosis is this?

-Contents of the nucleus become visible, DNA strands shorten and condense,
-Chromatin---> Chromosomes
-Centrioles separate and move to opposite poles of the cell and spindle fibres start to appear
-Nuclear envelope dissapears
-nucleus becomes visible

This process is the SAME as MITOSIS

The following processes are DIFFERENT from Mitosis:
-Homologous chromosomes pair up side by side (synapsis) so that corresponding genes are lined up side by side forming a tetrad
-The homologous chromosomes will criss cross over eachother and occasionally break and exchange segments.
Prophase 1
The following processes are DIFFERENT from MITOSIS:
-Chromosomes move to the center of the cell, centromeres are on the equator

The following is the SAME as mitosis:
-Spindle fibres attach to the centromeres
Metaphase 1
What phase of Mieosis is this?

-Homologous pairs separate (NOT sister chromatids separating at the centromere)
-Chromosomes move to opposite poles of the cell
-Should be 23 doubled chromosomes at each pole
Anaphase 1
What phase of mieosis is this?

-Chromosomes at opposite ends of the cell
-Chromosomes dont decondense to form chromatin
-Nuclear envelope occasionally reappears
-Cytokinesis occurs
Telophase 1
What phase in Mieosis is this?
-Cells move directly into metaphase since there is no DNA replication and there is no formal organization of the nucleus
-Chromosomes move to the center of the cell, centromeres on the equator
-spindle fibres attach to the centromeres
Metaphase 2
What phase of Mieosis is this?
-Chromatids separate @ the centromeres
-Chromatids move to opposite poles
-Should be 23 single stranded chromosomes at each pole
Anaphase 2
What phase of Mieosis is this?
-Chromosomes a opposite poles
-decondense to form chromatin
-nuclear envelope reappears
Telophase 2
What is it called when there is a separation of the cytoplasm and organelles?
Cytokinesis