Second is a video. Women's immune systems go all out to kill sperm that get past cervix - yet if her immune system consistently killed *all* the sperm in her she'd be a genetic dead end. This dynamic applies to behavior as well.https://www.youtube.com/watch?v=MoAUfnKcA3I …
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Source for the graphic in the first tweet: https://genome.cshlp.org/content/25/4/459.full …
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ok what the hell happened 10k years ago tho
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Women never had this bottleneck, but clearly faced evolutionary pressure.
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What’s the source of this image?
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