Question

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

• A. Gamete formation, fertilisation, zygote, embryo
• B. Embryo, zygote, fertilisation, gamete formation
• C. Fertilisation, gamete formation, embryo, zygote
• D. Gamete formation, fertilisation, embryo, zygote

Answer 1

The correct option is A

Gamete formation, fertilisation, zygote, embryo

The correct option is A.

Explanation for the correct option:

Option A:

1. A live entity creates its offspring through the biological process of reproduction, who are biologically identical to their parents.
2. The development of male and female gametes, which eventually fertilize to create an embryo, is the first step in human reproduction.
3. Since it takes place inside a female's body, the entire process of human fertilization is known as internal fertilization.
4. Meiosis (reduced division), in which a germ cell splits into two pieces and produces four gametes, is the process by which gametes are created.
5. Male and female gametes combine during fertilization to create a diploid (i.e., having paired chromosomes) zygote.
6. Fertilization is the process in which a woman's egg combines with a man's sperm to form an embryo.
7. Usually, the fallopian tube that connects an ovary to the uterus is where fertilization occurs.
8. An embryo begins to develop if the fertilized egg successfully passes through the fallopian tube and implants in the uterus.
9. The sperm and egg combine during fertilization to generate a zygote in one of the fallopian tubes.
10. The zygote then develops into a morula after passing through the fallopian tube.
11. A blastocyst develops from the morula once it enters the uterus.
12. The blastocyst then goes through implantation, during which it penetrates the uterine lining.
13. Initially, the zygote forms a solid ball of cells.
14. Afterward, it develops into a hollow ball of cells known as a blastocyst.
15. The blastocyst grows into an embryo linked to a placenta and surrounded by fluid-filled membranes inside the uterus, where it implants in the uterine wall.
16. Therefore, "Gametogenesis → Insemination →Fertilization Implantation →Gestation → Parturition" is the right response.

Final answer: The correct sequence of events during reproduction is gamete formation, fertilization, zygote, and embryo.