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27 RANDOM FERTILIZATION Average male between ages makes 200,000, ,000,000 sperm/day Females born with 1-2 million immature eggs Releases mature eggs in lifetime Egg 223 = 8.4 million possible combinations Sperm 223 = 8.4 million possible combinations 223 X 2 23 ~ 70 trillion diploid combinations (This doesn’t include crossing over!) Odds of one particular egg getting together with one particular sperm is astronomical. EVERYONE IS UNIQUE!

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