Nurturing Life Sciences
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#Unit 2. Cellular Organization
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An Interrupted Gene Consists of Exons and Introns.
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Exon Sequences Under Positive Selection Vary but Introns Are Conserved
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Erwin Chargaff gave four “rules,” known as parity rule for duplex DNA.
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The second parity rule applies more closely to introns than to exons.
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The length of Introns is variable while exons are almost constant in length.