Question

While looking at some seawater through your microscope, you spot the egg of an unknown animal. Which of the following tests could you use to determine whether the developing organism is a protostome or a deuterostome? A test to see whether the embryo _____.

Answer 1

A test to see whether the embryo exhibits spiral cleavage or radial cleavage.

Eight-cell stage in the development of animals differ between protostomes and deuterostomes. Cleavage of Protostomes is spiral and determinate, while in Deuterostomes is radial and indeterminate.

The stage of coelom formation also differs: in Protostomes it is schizocoelous-mesoderm forms coelom; in Deuterostomes it is enterocoelous-archenteron form coelom.

Final and main dfference:

• Protostomes-mouth develops from the blastopore

• Deuterostomes-anus end develops from blastopore.