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EBK LIFE: THE SCIENCE OF BIOLOGY
11th Edition
ISBN: 8220103935432
Author: Sadava
Publisher: MAC HIGHER
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Chapter 43.2, Problem 2R
Summary Introduction
To review:
The cleavage role by genes in the development is expressed in mammals but not in the frogs and sea urchins.
Introduction:
The phenomenon of cleavage in animals results in the multicellularity of the organism. The fusion of the male and the female gamete results in the formation of the single-celled zygote. The cleavage refers to the cell divisions that turn the diploid single-celled zygote into a mass of cells that are undifferentiated, which grows into an embryo. These cell divisions are not accompanied by the cell growth.
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- What would happen if one cell was removed or damaged at the 2-cell stage of sea urchin embryo development? What about if one cell was removed at the 4-cell stage? At the 8-cell stage? How about if two cells were separated after the first cleavage and allowed to develop on their own?arrow_forwardExplain how an understanding of cell lineages in Caenorhabditis elegans aids in the identification of mutations that affect the timing of developmental changes.arrow_forwardReferring to the diagram below explain how Drosophila segmentation is set up in the parasegments and how this is reflected in the mature segments. (a) Explain the signals (wingless, Hh, Serrate) how they are sent and received (b) what is the interaction between these signals and (c) how do these set up the final denticle pattern in the mature segment. asap pleasearrow_forward
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