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half the usual number of chromosomes

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having two sets of chromosomes or double the haploid number of chromosomes

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the exchange of genes between homologous chromosomes, resulting in a mixture or parental characterics in offspring

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a chromosome with the same gene sequence as another

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1. prophase 2- nuclear envelope breaks down and the spindle apparatus forms.
2. Metaphase 2- chromatids line up in the middle of the cell.
3. anaphase 2- centromeres separates and the sister chromatids move toward the opposite poles of the cell.
4. Telephase- nuclear envelope forms around eachset of chromosomes and cytokinesis occurs.

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1. prophase 1 crossing over occurs.
2.Metaphase - homologous pairs line up in the center.
3. Anaphase 1- a pair starts getting pulled to opposite sides of the cell.
4. telophase 1- a clevage burrow appears and at the end, 2 new cells are made.