Question

In human beings, the correct sequence of events during reproduction is

• A. gamete formation, fertilization, zygote, embryo
• B. embryo, zygote, fertilization, gamete formation
• C. fertilization, gamete formation, embryo, the zygote
• D. gamete formation, fertilization, embryo, the zygote

Answer 1

The correct option is A

gamete formation, fertilization, zygote, embryo

The correct option is option A.

Explanation for the correct options:

1. Reproduction is a biological process by which a living organism gives birth to its offspring, which is biologically similar to its parents.
2. In humans, reproduction occurs as a result of the fusion of male and female gametes, which later fertilize to give rise to an embryo.
3. These male and female gametes are produced in their respective parent's bodies.
4. The complete process of fertilization in humans is called internal fertilization, as it occurs within the body of a female.
5. Male and female reproductive cells undergo a meiotic cell division to form their gametes.
6. In humans, male gametes are motile and female gametes are non-motile.
7. Therefore the male gametes are transferred into the female’s body for the further process of fertilization.
8. This is done by fusion or copulation.
9. After the transfer and fusion of male and female gametes, fertilization occurs with the formation of a diploid zygote.
10. As a result of fertilization, the zygote is formed.
11. The zygote divides mitotically to form 2, 4, 8, and 16 celled stages.
12. These cells are known as blastomeres.
13. The embryo will form at the stage called the gestational period.
14. Between eight and ten weeks, the embryo develops into a fetus.

Final answer: In human beings, the correct sequence of events during reproduction is gamete formation, fertilization, zygote, and embryo.