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Bio 201 · Cell Division

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Mitosis vs. Meiosis

• Mitosis → 2 identical diploid cells (growth & repair)

• Meiosis → 4 unique haploid cells (gametes)

• Crossing-over only happens in prophase I

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“...so mitosis produces two identical cells for growth and repair, while meiosis produces four unique cells called gametes...”

“Mitosis produces two identical diploid cells for growth and repair. Meiosis produces four unique haploid cells, and crossing-over during prophase I creates genetic variation...”

12:48 of 48:16

Notes

• Mitosis: 2 identical cells
• Growth and tissue repair

• Meiosis: 4 unique cells
• Crossing-over in prophase I

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What's different about prophase I vs. mitosis?

Per your notes: prophase I includes crossing-over between homologous chromosomes — that's what creates genetic variation.

Can you give me a quick way to remember that?

Think “Meiosis mixes.” Homologous chromosomes swap matching pieces in prophase I, creating four genetically unique cells.

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