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MR 1.00 Mental Retardation Due to Chromosomal Abnormalities

an abnormality of chromosome number or structure

Chromosomes are the threadlike or rodlikeStructures that hold our genes.

Genes are the individual instructionsThat tell our bodies how to developAnd function; they govern our physicalAnd medical characteristics, such as

Hair colorBlood typeSusceptibility to diseaseOccupy specific positions on chromosome1Diagnostic Symptoms

Occurs when an individual is missing a chromosome from a pair (monosomy) or has more than two chromosomes of a pair (trisomy)

Ex: Down Syndrome-trisomy 21 Turner Syndrome- monosomy 13