Preimplantation genetic diagnosis is done:

A) on cells of an in vitro fertilized embryo
B) in the womb, before birth
C) after a woman is pregnant, but before the embryo implants
D) with the help of ultrasound
E) before fertilization on the sperm and the egg

Preimplantation Genetic Diagnosis

A technique used to identify genetic defects in embryos created through in vitro fertilization before pregnancy, to prevent certain genetic diseases.

In Vitro Fertilized Embryo

An embryo created by fertilizing an egg with sperm outside the body, typically in a laboratory setting, before being transferred to the uterus.