Arrange the following events in correct chronological order in human reproduction.

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Multiple Choice

Arrange the following events in correct chronological order in human reproduction.

Explanation:
Fertilization must occur first to create the zygote, the single cell formed when sperm and egg join. That zygote then undergoes rapid cell divisions (cleavage) to become a multicellular structure, eventually evolving into a blastocyst, which is the hollow stage ready for implantation. So the natural order is fertilization → zygote → blastocyst. A sequence placing the blastocyst before the zygote isn’t possible because the blastocyst arises only after the zygote forms and divides. Similarly, fertilization cannot occur after the zygote or blastocyst have formed, since the zygote is defined as the product of fertilization.

Fertilization must occur first to create the zygote, the single cell formed when sperm and egg join. That zygote then undergoes rapid cell divisions (cleavage) to become a multicellular structure, eventually evolving into a blastocyst, which is the hollow stage ready for implantation. So the natural order is fertilization → zygote → blastocyst. A sequence placing the blastocyst before the zygote isn’t possible because the blastocyst arises only after the zygote forms and divides. Similarly, fertilization cannot occur after the zygote or blastocyst have formed, since the zygote is defined as the product of fertilization.

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