Reduction Division

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############################# Video Source: www.youtube.com/watch?v=Tsq5K--Tkiw

Visit our website: http://www.sliderbase.com/ • Free PowerPoint Presentations for teaching and learning • Meiosis • Sex cells divide to produce GAMETES (sperm or egg). • Gametes have HALF the # of chromosomes. • Occurs only in GONADS (testes or ovaries). • Male: SPERMATOGENESIS -sperm • Female: OOGENESIS - egg or ova • Crossing Over • Crossing over may occur between non-sister chromatids at sites called chiasmata. • Crossing over: segments of nonsister chromatids break and reattach to the other chromatid. • Chiasmata (chiasma) are where chromosomes touch each other and exchange genes (crossing over.) • Causes Genetic Recombination

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