Difference Between Zygote, Embryo And Fetus


 
 
Concept Explanation
 

Difference Between Zygote, Embryo And Fetus

A zygote forms after fertilisation. A zygote becomes an embryo. And finally, an embryo becomes a foetus. The main differences between zygote embryo and foetus are given on the next page.

S. No Zygote Embryo Foetus
1. A zygote is formed by the fusion of male and female gametes (sperm and egg) An embryo is formed by the repeated cell division of a zygote. A foetus is formed by the growth of an embryo.
2. A zygote is the beginning of the formation of a baby. An embryo is an unborn baby in the uterus in the early stages of development (up to 8 weeks) A foetus is an unborn baby in the uterus in the later stages of development (after 8 weeks till birth).
3. A zygote is a single cell. It is smaller than a full stop (.) An embryo is multicellular. The body features of growing baby in the embryo are not much developed. A foetus is also multicellular. The body features of developing baby (like hands, legs, head, eyes and ears, etc.) can be identified.
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Sample Questions
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Question : 1

An embryo is formed by the repeated ______________ division of a zygote.

Right Option : C
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Question : 2

A zygote is formed by the _____________________ of male and female gametes (sperm and egg)

Right Option : B
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Question : 3

Which of the following are correct :

(a) A zygote is the beginning of the formation of a baby.

(b) An embryo is formed by the repeated cell division of a zygote.

(c) A foetus is formed by the growth of an embryo.

Right Option : D
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