Ray has a chromosomal abnormality, caused by an extra chromosome on the 21st pair. This abnormality has retarded Ray's mental growth and is called

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Quizplus · Accepted Answer

The chromosomal abnormality described is characteristic of Down syndrome, which is characterized by intellectual disability and distinct physical features. Klinefelter's syndrome (B) is a sex chromosome abnormality in which males have an extra X chromosome and can result in infertility and other physical characteristics. XYY syndrome (C) is another sex chromosome abnormality in which males have an extra Y chromosome, but it is not typically associated with intellectual disability. FSH (D) is a hormone produced by the pituitary gland that stimulates the development of follicles in the ovaries and testes and is not related to chromosomal abnormalities.

Ray Has a Chromosomal Abnormality, Caused by an Extra Chromosome