Which of the following correctly represents the chronological order of human development during gestation?
Show answer & explanation
Correct answer: C
Explanation
Answer: Zygote → Embryo → Fetus
Explanation: Human development during gestation follows a fixed biological sequence:
Zygote: Formed immediately after fertilization when sperm and egg fuse. It is a single cell stage.
Embryo: After repeated cell division, the zygote becomes an embryo. This stage involves formation of basic body structures and organs (organogenesis). It lasts roughly up to 8 weeks.
Fetus: From around the 9th week until birth, the developing baby is called a fetus. Growth and maturation of organs occur during this stage.
So, the correct chronological order is Zygote → Embryo → Fetus.
Additional Key Facts:
Fertilization usually occurs in the fallopian tube.
Implantation of the embryo occurs in the uterus.
Major organ formation happens during the embryonic stage, making it a critical period.
The fetal stage is mainly for growth and functional development.
Human gestation period is approximately 9 months (about 40 weeks).
Potential Exam-Oriented Questions & Answers:
Question: What is the embryonic stage responsible for?
Answer: Formation of major organs and body structure.
Question: When is a developing human called a fetus?
Answer: From the 9th week until birth.