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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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We replace more than a gram of skin cells every day (older cells shed as we move) and our bone marrow keeps developing millions of new red blood cells each minute of our lives. Fertilization How gametes fuse with each other Cellular division. How is cell division regulated? In addition, some animals can regenerate severed parts, and many species do metamorphosis (such as the transformation of a tadpole into a frog or a caterpillar into a butterfly).
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Thus, developmental biology is a discipline that studies embryonic and subsequent development processes.The development has two main goals: Create cellular diversity and order in each generation. It ensures the continuity of life from one generation to the next. developmental hierarchy is a hierarchical series of decisions involving specific already existing cell types. These developmental decisions are usually irreversible that they gradually and irreversibly limit cell fate.
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A third anatomical approach to developmental biology is teratology, the study of birth defects. These anatomical abnormalities can be caused by mutant genes or substances in the environment that hinders development. The study of abnormalities is often used to find out how normal development occurs.