Author: Nathan Lampson

This lesson will explain how a zygote develops into an embryo.

See More
Try a College Course Free

Sophia’s self-paced online courses are a great way to save time and money as you earn credits eligible for transfer to over 2,000 colleges and universities.*

Begin Free Trial
No credit card required

28 Sophia partners guarantee credit transfer.

263 Institutions have accepted or given pre-approval for credit transfer.

* The American Council on Education's College Credit Recommendation Service (ACE Credit®) has evaluated and recommended college credit for 25 of Sophia’s online courses. More than 2,000 colleges and universities consider ACE CREDIT recommendations in determining the applicability to their course and degree programs.

Terms to Know

After the morula forms it will implant on the endometrium of the uterus; the blastocyst contains an inner of layers of cells that become the embryo while the outer layer of cells form the placenta.


A stage of development of an individual formed from the inner cell mass of a blastocyst after it has implanted in the uterus.

Inner Cell Mass

A layer of the blastocyst which will develop into an embryo.


The fertilized egg which is the first cell of an individual.