Health

Allele is one of a pair of genes

Fetus receives oxygen and disposes carbon dioxide at the placenta. This is facilitated by fetal hemoglobin, which has a higher affinity for oxygen that does material hemoglobin.

Amnion provides watery environment, prevent shocks to embryo/fetus.

A placenta is site of exchange of food, Oxygen, water, and waste between the mother and the fetus.