Department of Paediatircs
Genetics Study Group
Hironao NUMABE, M.D.
Here, I present the process of nondisjunction in the first meiotic division of Down syndrome (trisomy 21).
Similar nondisjunction in the second meiotic division may occur in the case of Down syndrome.
The nondisjunction may occur in spertomatogenesis as well as in ovogenesis.
cf. Animation of Translocation Type Down Syndrome
These animations are generalized images and are not reliable.
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