The following are various developmental phenomena relating to the concepts and principles in developmental biology. A. Concept of apoptosis B. Concept of prefomed guidelines C. Concept of programmed gene action D. Concept of capacity E. Concept of fate F. Concept of environmental influences G. Concept of induction H. Concept of progressively formed guidelines I. Concept of Differentiation J. Concept of guidelines K. Concept of Gradient L. Concept of differentiation Question #1. Some genes switched on all the time whereas other are genes are "turned off" at certain stage of development. What concept? Queation #2. The blastomeres can become any cell of the body. What concept? Question #3. The limb bud consists of different cells which give rise to the limb. What concept?

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