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Meiosis I
The first division of a two-stage process of cell division in sexually reproducing organisms that results in cells with half the chromosome number of the original cell.
Meiosis II
The second division of a two-stage process of cell division in sexually reproducing organisms that results in the cells with half the chromosome number if the original cell.
Synapsis
The pairing of replicated homologous chromosomes during prophase I of meiosis.
Crossing over
The reciprocal exchange of genetic material between nonsister chromatids during prophase I of meiosis.
Tetrad
A paired set of homologous chromosomes, each composed of two sister chromatids. Tetrads form during prophase I of meiosis.
Chiasma
The X-shaped, microscopically chromatids that have exchanged genetic material through crossing over during meiosis.
Recombinant Chromosome
A chromosome created when crossing over combines the DNA from two parents into a single chromosome.
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