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| Modern Genetic Analysis Chapter 4. The Inheritance of Genes Cell Division Figure 4-8. Chromatid formation and underlying DNA replication. (Left) Each chromosome divides longitudinally into two chromatids; (right) at the molecular level, the single DNA molecule of each chromosome replicates, producing two DNA molecules, one for each chromatid. Also shown is an allele b+ and its mutant form b, caused by a change of a single base pair from G·C to A·T.

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