Es un trastorno genético en el cual una persona tiene 47 cromosomas en lugar de los 46 usuales.
TrisomÃa 21
En la mayorÃa de los casos, el sÃndrome de Down ocurre cuando hay una copia extra del cromosoma 21. Esta forma de sÃndrome de Down se denomina trisomÃa 21. El cromosoma extra causa problemas con la forma como se desarrolla el cuerpo y el cerebro.
El sÃndrome de Down es la causa individual más común de anomalÃas congénitas en los seres humanos.
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ACOG Committee on Practice Bulletins. ACOG Practice Bulletin No. 77: screening for fetal chromosomal abnormalities. Obstet Gynecol . 2007 Jan;109(1):217-27.
AAP Committee on Genetics. Health supervision for children with Down syndrome. Pediatrics . 2001 Feb;107(2):442-9.
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