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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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12 years ago
What's the difference between an embryo, a zygote and a fetus?
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#1
12 years ago
They are similar.  A zygote forms after fertilization.  A zygote becomes an embryo which becomes a fetus.

An embryo  is a multicellular diploid eukaryote in its earliest stage of development.

In organisms that reproduce sexually, once a sperm fertilizes an egg cell, the result is a cell called the zygote that has all the DNA of two parents.

A fetus (or foetus, or f?tus) is a developing mammal or other viviparous vertebrate, after the embryonic stage and before birth.
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#2
12 years ago
Nothing more than time.

Zygote -> Embryo -> Fetus -> Baby

Each stage gets more complex and larger than the one before until you have yourself a functioning baby animal / person.
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#3
12 years ago
Egg>Zygote>Embryo>Fetus>Newborn
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