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I found this review from 1999. From the abstract: It is concluded that DNA-DNA interactions cannot bridge the distances between homologous chromosomes in the nucleus, and it is suggested that protein chains are formed between homologous segments. These attach to homologous chains emanating from homologous sequences in other chromosomes, and the chains ...


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Activation and deactivation of different genes commands the process of cell differentiation. Gene expression responsible for cell differentiation is controlled by intrinsic and extrinsic signals. This regulated signalling from inside and outside the cell is responsible for embryonic development. Environment around the cell, such as small molecules, ...


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The cells differentiation during post fertilization period is govern by a set of regulatory genes called Homeotic genes.These are genes that "select" the identity of entire segments or structures in the bodies of developing organisms. These gene encodes a transcription factor that is expressed in a specific region of the organism starting in its early ...


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