jimfazio123 t1_jdososg wrote on March 26, 2023 at 12:36 AM

Reply to comment by LittleFairyOfDeath 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

The placenta is made by the fertilized egg, which is jointly created by the sperm and the unfertilized egg.. so no, the placenta is not made by the mother.

LittleFairyOfDeath t1_jdqc0i4 wrote on March 26, 2023 at 10:45 AM

Again the spermcell provides very little. Yes 50% of genetic material but everything else, like the mitochondria is from the mother.