what is a fertilized egg called

A fertilized egg is called a zygote.

Quick Scoop: What Happens at Fertilization?

When a sperm successfully fuses with an egg (ovum), their genetic material combines to form a single new cell. That first cell of a new organism is the zygote, and it contains a full set of chromosomes from both parents.

• The unfertilized egg is called an ovum.

• The fertilized egg right after fusion is called a zygote.

• As it divides further, it passes through stages like morula and blastocyst , and after implantation it is called an embryo.

In simple terms: sperm + egg → zygote → embryo → fetus (later in pregnancy).

TL;DR: If you’re wondering “what is a fertilized egg called,” the accurate biological term is zygote.

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