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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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irina irina
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11 years ago
What is the difference between an egg, a zygote, an embryo, and a fetus?
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#1
11 years ago
A zygote is a newly fertilised ovum. With one cell  (when it divides to two it is called a conceptus)

Egg is not really used, before fertilisation it is called on Oocyte, then various names are used depending on what stage of division it is at.

Wiki says that and embryo is used between the age of 0-8 weeks then fetus after that.

http://en.wikipedia.org/wiki/Embryo
wrote...
#2
11 years ago
an egg is a single reproductive cell. it is the female gamete.
a zygote is a fertilized egg (an egg that has combined with a sperm cell).
an embryo is when the zygote starts to grow and divide. it is the earliest stages of life.
a fetus is when the animal is in later stages of development. it is when the offspring starts to resemble an adult and has recognizable features.
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