डाउन सिंड्रोम क्या होता है?
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Answer:
Down syndrome (46+1 trident of 21sr chromosome)
Down syndrome is a disorder arising due to chromosomal abnormality. this is the first discovered and describes chromosomal disorder in human beings. this disorder is characterized by the presence of 47 chromosomes. it is describes as Trisomy of the 21st chromosomes. infants with this disorder have one extra chromosome with the 21 St pair in every cell of their body therefore they have 47 choromosems instead of 46. children suffering from Down's syndrome are usually mentally retarded and have a short lifespan .mental retardation is the most prominent characteristics. other symptoms include short height, short wife next, flat nose, short finger, scanty hair single horizontal crease in Plam, qnd w life expectancy of about 16 -20 years.