The shortest phase of prenatal development is called the germinal, or zygotic, period.

Name: The shortest phase of prenatal development is called the germinal, or zygotic, period.
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The germinal period lasts approximately the first 2 weeks after conception, and is the shortest phase of prenatal development. It is also known as the zygotic period because it refers to the time when the zygote (formed by the fusion of sperm and egg) undergoes rapid cell division and becomes a blastocyst.

The Shortest Phase of Prenatal Development Is Called the Germinal