What results from the spiral cleavage of mollusks?

Human Anatomy & Physiology (11th Edition)
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ISBN:9780134580999
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Chapter1: The Human Body: An Orientation
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1. What results from the spiral cleavage of mollusks? 2. A nodal mutation in the snail affects the following downstream protein?
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Step 1 Introduction of cleavage in animal groups

 

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Spiral holoblastic cleavage is characteristic of several animal groups, including annelid worms, some flatworms, and most molluscs

Cleavage -After fertilization, the development of a multicellular organism proceeds by a process called cleavage, a series of mitotic divisions whereby the enormous volume of egg cytoplasm is divided into numerous smaller, nucleated cells. These cleavage-stage cells are called blastomeres.

 

 

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