ZOO501 FINAL TERM SOLVED PAPERS

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Developmental Biology:

All multicellular organisms arise through a slow process of progressive change called evolution. Development is the process by which a multicellular organism arises, initially from a single cell. a fertilized egg or zygote that divides mitotically to produce all the cells of the body. The study of animal development from this stage is traditionally called embryology an organism that exists between fertilization and birth.

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ZOO501 FINAL TERM SOLVED PAPERS
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There seem to be two main strategies for creating commitment and thus initiation series of events that lead to cell differentiation.  Inheritance of cytoplasmic determinants: Cytoplasmic determinants are molecules in the cytoplasm that can help determine cell fate. Asymmetric distribution of cytoplasm of determinants suggests that the mechanism of differentiation is entirely internal.

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When cell fate is constrained after each decision in the developmental hierarchy, cells commit to a certain destiny.
An uncommitted cell can be described as naive, meaning it has not received any instructions to direct it along a specific development path.

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The first stream is comparative embryology, the study of how anatomy changes over time the development of different organisms. For example, a comparative embryologist may study which tissues make up the nervous system in a fly or a frog.

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