LittleFairyOfDeath t1_jdqc0i4 wrote
Reply to comment by jimfazio123 in TIL, the placenta that forms with a fetus isn't created by the mother. It grows from the fertilized egg and some fetuses actually develop outside the uterus attached to the intestines in the body cavity. by darw1nf1sh
Again the spermcell provides very little. Yes 50% of genetic material but everything else, like the mitochondria is from the mother.
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