Biology 11 : Mitosis vs Meiosis Simplified

Mitosis • Nuclear Division • Diploid to Diploid • Stomatic (body) cells • One division o Separate the sister chromatid



o Meiosis • Reduction Division • Diploid to haploid • sex cells (gamete) • 2 divisions • start with 4 chromosomes • Tetrad formation (2 sets of sister chromatids) • Homologous (the same) • Division #1 – separate the tetrads • Division #2 - Separate sisters • Crossing over (Prophase 1/Overlap Chiasma)



Spermatogenesis

Sperm made all the time Female eggs are limited and predefined

Oogenesis Egg is cytoplasm (good food) – needs to travel all the way down to the endotremendium lining Non-disjunction