Principles of Development

Transcriptional control is responsible for

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Unformatted text preview: e sending and receiving signals. When a signal arrives at the surface of a cell, its message is received and processed. In most cases, cells change their activity in response to these signals. ♣Cells become specialized because they express different genes, not because they contain different genes. Differentiated plant cells are genetically equivalent. (contain the same gene) Tobacco plant grown from carrot plant Differentiated animal cells are genetically equivalent More difficult to prove. Dolly – cloned sheep. Genetically identical to mammary- cell donor. Grew into a fertile adult, and by normal mating, produced her own lamb But her age is as old as her mammary- cell donor sheep? Taken together, research on cloning plants and animals has shown that in most cases, cellular differentiation does not involve changes...
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