Lesson 25: Embryology Week 1

Embryology Week 1

We will see the zygote split in half, then in half again and again until it becomes a ball.  The ball becomes hollow and then differentiates into a mass that will become placenta and a mass.



48 minutes

Template page for drawing 25

Info page for drawing 25

Finished drawing sample for lesson 25


Sand dollars (sea biscuits) and sea urchins are often used for embryology studies instead of human eggs and sperm.  Oddly enough, these simple creatures have an early development that correlates quite closely with human development.  Here is a video that shows beautiful video footage of the reproductive process of these creatures.


NOTE: If this online quiz is not working, you can download a printable version on the home page for this module.

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