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| Gene Expression in Eukaryotes |
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| In higher eukaryotes the genome is highly complex. Drosophila for example, has any where between 5,000 and 10,000 genes. Human haploid genome is known to have any where between 30,000 and 1,00,000 genes. As a result gene expression in eukaryotes is highly complex. The eukaryotic gene has sequences of nitrogen bases called introns which do not code for amino acids. The introns occur in between stretches of coding sequences called exons. The mRNA transcribed hence has several unwanted regions. These regions get removed by nucleases and the coding sequences are joined together by a process called splicing. The processed mRNA is used for translation. |
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| fig. 22.8 Relationship Between Gene, Unprocessed mRNA and Final mRNA |
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