After fertilisation, which event occurs first during normal early development?
Correct answer: B. Repeated cleavage divisions of the zygote
- A. Formation of the placenta
- B. Repeated cleavage divisions of the zygote
- C. Development of the fetal circulation
- D. Formation of the neural tube
Explanation
The zygote first undergoes rapid mitotic cleavage divisions as it travels toward the uterus. Placental development and organ formation occur later, and the neural tube forms after implantation during early embryonic development.
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About Reproductive Anatomy and Conception
Female and male reproductive organs, pelvic anatomy, gametogenesis, the menstrual cycle and the hormonal control of ovulation lead into fertilisation, implantation and early embryonic development. Questions distinguish ovulation from menstruation, fertilisation from implantation, and the normal anatomical changes that allow conception and pregnancy to occur.
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