Explain the phases in embryonic development from the morula stage till the establishment of pregnancy in a human female. - Biology | Shaalaa.com

Embryology | Definition & Stages

How a Human Embryo Develops into a Fetus | Britannica

A Blighted Ovum happens when a pregnancy sac forms in the uterus, but the embryo either never develops or stops developing very early. The body still produces pregnancy hormones, so a woman may still feel pregnant.. Common Causes ✓ Chromosomal problems (most common cause) ✓Poor egg or sperm quality ✓Genetic abnormalities preventing embryo growth ✓Sometimes occurs without a clear reason Possible Signs ✓Pregnancy test remains positive ✓Pregnancy symptoms may continue at first ✓Light bleeding or sp