If there's an extra chromosome in the autosomes, the karyotype would be something like this: 44, xy+21 (trisomy 2 or Down syndrome). But what happens if a chromosome is missing? Also +21 or -21, or something completely different?
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The caryotype for autosomes differs from that of an X chromosome or a missing chromosome. If a caroma is missing, the caryotype 46, XX (Trisomie 21 or Down syndrome) is. If, however, an X chromosome or a chromosome is missing, the caryotype is 46, XY (testicular dysgenesia or Swyer syndrome). Finally, if a chromosome has 3 copies instead of 2 copies, the caryotype is 61, XXXX (polyploid).