Lesson Flashcards: Fertilization and Pregnancy

The innermost extraembryonic membrane that encloses a developing embryo or fetus

The extensions from the chorion that associate with the endometrium of the mother’s uterus, forming the placenta

Twins that develop from two separate zygotes, where two egg cells are fertilized by two separate sperm cells

The female reproductive cell, or gamete

The fluid surrounding the embryo or fetus within the amnion that protects the fetus from trauma and temperature fluctuations

The outermost extraembryonic membrane that surrounds the developing embryo or fetus

A cap-like organelle that coats the anterior of the head of a sperm cell and contains enzymes capable of digesting the coating of an egg cell

The early developmental stage of an organism after a zygote has undergone cleavage and before it develops into a fetus

The outer layer of cells surrounding the zona pellucida of an egg cell

The biological process in which the male inserts his penis into the female’s vagina