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meiosis
female parent cell
oocyte
male parent cell
sprematocyte
Prophase 1
homologous chromosomes exchange genetic info by crossing over each other, leading to genetic variation
Metaphase 1
homologous PAIRS randomly line up at the equator (independent assortment) which leads to genetic variety in gametes
Nondisjunction
chromosomes don’t separate properly during anaphase
Trisomy 21
downs syndrome
Note 
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