Articles > Quizzes & Surveys > Zygote definition – quiz Zygote definition – quiz Quiz Choose the best answer. 1. What is a zygote? A gamete A fertilized prokaryote A fertilized eukaryotic cell 2. In humans, a zygote forms from ... fertilization mitosis cell division 3. In humans, this cell is diploid egg cell sperm cell zygote 4. The union of the gametes' cytoplasms during fertilization Plasmogamy Karyogamy Polyploidy 5. The union of the gametes' nuclei during fertilization Plasmogamy Karyogamy Polyploidy Send Your Results (Optional) Your Name To Email Time is Up!