During meiosis I, homologous pairs of chromosomes line up at the equator of the cell, also known as the metaphase plate. This process is called synapsis. Once aligned, the homologous chromosomes exchange genetic material through a process called crossing over. After crossing over, the homologous chromosomes separate, and are pulled to opposite poles of the cell by the spindle fibers. This results in the formation of two daughter cells, each with one copy of each homologous pair of chromosomes. This process is known as disjunction.
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