A Fertilized Egg, Which Represents the First Cell of a New

Question

A fertilized egg, which represents the first cell of a new individual, is called a(n) ________.
A) blastocyst
B) zygote
C) fetus
D) embryo

Accepted Answer

A fertilized egg is called a zygote. A blastocyst is a stage of development that comes later, after the zygote has divided multiple times to form a hollow ball of cells. An embryo is a later stage of development that occurs after the blastocyst implants in the uterus. A fetus is an even later stage of development that occurs after the embryo has undergone significant cell differentiation and organ development.