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    2.1: Heredity
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    1. dachejackson 23 May 2026
      the cell's nucleus making an exact copy of all the chromosomes and splitting into two new cells

      An issue during mitosis causes an extra copy of chromosome 21 to appear.

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    socialsci.libretexts.org/Bookshelves/Human_Development/Lifespan_Development:_A_Psychological_Perspective_4e_(Lally_and_Valentine-French)/02:_Heredity_Prenatal_Development_and_Birth/2.01:_Heredity