Different Results Are Achieved When an Eight-Cell Sea Urchin Embryo

question 46

Multiple Choice

Different results are achieved when an eight-cell sea urchin embryo is bisected horizontally as opposed to when it is bisected vertically.This observation supports which statement?

• A) Cellular determinants are equally distributed in the embryo.
• B) Differentiation has occurred by the eight-cell stage.
• C) Inducers have determined cell fate by the eight-cell stage.
• D) Polarity exists in the embryo by the eight-cell stage.
• E) All cells of the eight-cell stage are totipotent.

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