Matlock Bioethics Practice Exam

Which term describes the fertilized egg prior to implantation?

Embryo Gamete Zygote Fetus

Correct Answer:

Zygote

Explanation:

The fertilized egg prior to implantation is called a zygote. It forms when a sperm22 and an egg fuse, creating a single cell that carries genetic material from both parents. This zygote begins rapid divisions as it moves toward the uterus, and implantation into the uterine lining happens later. After implantation, the developing organism is typically called an embryo for the first two months, and later a fetus through birth. A gamete is the egg or sperm themselves before fertilization, not the product after fertilization, and a fetus is a later developmental stage.

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