Research has shown that the mechanisms for cell

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Unformatted text preview: a particular pattern of gene expression, trigger the differentiation pathways that generate a, , and a / cell types in yeast. Mating between a and a cells is directed by another genetic program. Research has shown that the mechanisms for cell communication, the control of gene expression, and the differentiation of cell types are based on the same principles in yeast and multicellular, higher eukaryotes. What we learn from yeast will very likely tell us a great deal about ourselves. Mounting evidence suggests that similar proteins in yeast and humans carry out most cellular processes. It also indicates that human genes closely related in sequence and function to the regulatory genes of yeast play similar regulatory roles in human cells. Geneticists have already sequenced the entire yeast genome and thereby produced a comprehensive catalog of more than 6000 gene functions required to make a eukaryotic cell. In the next genetic portrait (Portrait B), we move from the differentiation of single-celled eukaryotes to the development of multicellula...
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