Multiple choice

Which one of the following is the cause of Klinefelter’s syndrome?

  1. Absence of one of the X-chromosomes i.e. 45 with XO.

  2. Presence of an additional copy of X-chromosome i.e. 47 with XXY.

  3. Presence of an additional copy of chromosome number 21.

  4. Substitution of glutamic acid (Glu) by valine (Val) at the sixth position of the beta globin chain of haemoglobin molecule.

  5. Lack of enzyme that converts the amino acid phenylalanine into tyrosine.
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B Correct answer
Explanation

Presence of an additional copy of X-chromosome i.e. 47 with XXY is the cause of Klinefelter’s syndrome.

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