A pair XX chromosomes give rise to baby girl whereas XY give rise to a baby boy but why if it is XXY or XXX?

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Solution

The individual with 44+ XXY genetic constitution is sterile male with undeveloped testes, mental retardation, female like sparse body hair and knock knees, long limbs and with some female characteristics such as feminine pitched voice and enlarged breasts.
The individual with 44+XXX genetic constitution is a superfemale. Such female is characterized by abnormal sexual development and mental retardation.

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