Which prenatal development stage involves the formation of the zygote and its implantation into the uterine wall?

• A. Germinal stage
• B. Embryonic stage
• C. Fetal stage
• D. Postnatal

Answer: (A)

The main idea here is the early prenatal period when fertilization leads to a zygote and this cell implants in the uterine wall. This happens during the germinal stage. At conception, the sperm and egg fuse to form a zygote, which then starts rapid cell division as it moves down the fallopian tube. The developing cluster becomes a blastocyst and, crucially, implants into the lining of the uterus during this stage, roughly the first two weeks of development. After implantation, development shifts to the embryonic stage, which focuses on organ formation, followed by the fetal stage characterized by growth and maturation. Postnatal refers to the period after birth.