Sea Star Development

• Fertilization: the union of a sperm and an egg to form a single diploid cell called a zygote.
• Cleavage: during this stage, a large number of mitotic cell divisions occur, but the cells do not grow, so the mass of cells is no larger than the original zygote.
• Blastula:  hollow ball of cells formed after cleavage.
• Gastrulation:  the process by which the hollow ball of cells undergoes an inpocketing of cells to form a gastrula.  Surface cells migrate into the interior of the embryo and eventually form three embryonic germ layers.

Practical Exam Review: Bring study guides 1-9 and your questions to lab.

Pigs must remain in the classroom!

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