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Lecture 20a - Supplementary Information on Disorders Due to Chromosome Numbers (Interest Only)

Lecture 20a - Supplementary Information on Disorders Due to Chromosome Numbers (Interest Only)

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1 Lecture 20a Supplementary Information on Disorders due to Chromosome Numbers You are not responsible for this information. It will not be on the exam. During S stage, the DNA replicates. The two original strands separate and another strand is formed on each strand. This is called “semi- conservative” (half of the original strand is kept) replication. Original strand New strand The Key stage which starts everything is interphase In the two strands of DNA, the bases are also complementary The complementary strands are coiled into a helix. Since one spiral is coiled around another spiral, the structure is called a double helix. The helix is wrapped around proteins called histones. And then coiled some more.
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2 And coiled some more so that in mitosis it looks like this. The parts of a chromosome during mitosis. Note that the chromosome has already replicated. Each chromatid is really a complete chromosome. However, because they
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