Biology
215 Labs: Fertilization
In
this laboratory you will work with live sea urchins, examining the process
of fertilization. Sea
Urchins and seastars belong to the Phylum Echinodermata. Phylum Echinodermata
and Phylum Chordata are both deuterostome coelomates, thereby having
similar early development. Answer
the questions below and in the "For further thought..." section to better
prepare you for the laboratory session.
| This is an unfertilized egg, magnified 400x. |  |
 |
In the fertilized egg to the left, notice the fertilization membrane which forms minutes after fertilization.
What is the purpose of this membrane?
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