Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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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?
Expert Solution
Step 1 Introduction of cleavage in animal groups
Ans)
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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