Harry has been suffering from mental retardation and a learning disability since infancy.Subsequent tests revealed an abnormality in his X chromosome,which becomes constricted and often breaks.Identify the syndrome that Harry suffers from.
A)Turner syndrome
B)Fragile X syndrome
C)XYY syndrome
D)Klinefelter syndrome

Question

Quizplus · Accepted Answer

Fragile X syndrome is caused by a mutation on the X chromosome, where the X chromosome becomes constricted and often breaks. This syndrome is associated with intellectual disability and learning difficulties. Turner syndrome (A) occurs when one of the X chromosomes is missing or abnormal, resulting in physical and reproductive abnormalities. XYY syndrome (C) occurs when a male has an extra Y chromosome, but it is not typically associated with intellectual disability or learning difficulties. Klinefelter syndrome (D) occurs when a male has an extra X chromosome, but it too is not typically associated with intellectual disability or learning difficulties.

Harry Has Been Suffering from Mental Retardation and a Learning