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What is a chromosome called in the unduplicated form?

A:

Quick Answer

According to class notes from Science Prof Online, non-duplicating DNA molecules are bundled in long strands called chromatin. Prior to mitosis, the DNA replicates in this chromatin form. In the early stage of mitosis, chromatin condenses into chromosome form. Each chromosome is comprised of two identical sister chromatids.

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Full Answer

Each chromosome has a constriction point called the centromere, which divides each sister chromatid into two sections. According to Genetics Home Reference, these divides are referred to as "arms." The short arm of the sister chromatids is the "p arm," and the long arm is the "q arm." During the later stages of mitosis, the sister chromatids are pulled apart at their centromere, as each is separated to its own half of the dividing cell. A tutorial from the University of Arizona's biology department explains that the resulting daughter cells each have a matching chromatid.

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