Why are some chromosomal abnormalities (Downs Syndrome) allowed to continue through a normal pregnancy where almost all other chromosomal abnormalities are miscarried?

Question

How does the body know which chromosomal abnormality is good enough to become a person and others are better to be ended?

In: Biology

Answer 1

There are tons of chromosomal abnormalities that go through, not just downs. Color blindness, missing limbs, red hair… 🤣

Some abnormalities, prevent the embryo from living. It’s not the mother’s body that determines this, but the embryo itself. If the cells do not replication and function within certain bounds then they die.