Overview of the syndrome of 12 chromosomal short arm partial trisomy

Encoding over 1100 genes within 132 million bases,chromosome 12 makes up about 4.5 ％ of the human genome.The short arm of chromosome 12 trisomy is a rare chromosomal abnormalities Which is performance of the multi-face with a special,low ear position,growth retardation,hypotonia.different occurrence of aberrations of chromosome karyotype and clinical severity and there is a differenee. Key words: Chromosome 12 p ;  Chromosomal karyotype ;  Trisomy 12p