Section 3

Meiosis

Meiosis is a process of nuclear division that reduces the number of chromosomes in new cells to half the number in the original cell. The halving of the chromosome number counteracts a joining of cells later in the life cycle of the organism.

objectives

• Compare the end products of

meiosis with those of mitosis.

• Summarize the events of meiosis I.

• Explain crossing-over and how it contributes to the production of unique individuals.

• Summarize the events of meiosis II.

• Compare spermatogenesis and oogenesis.

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