Pick out the correct statements.
(a) Down’s syndrome is due to trisomy.
(b) Klinefelter’s syndrome is due to nullisomy.
(c) Turner’s syndrome is due to monosomy.
(d) Edward’s syndrome is due to tetrasomy.

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(a) and (c) are correct

(b) and (d) are correct

(a), (c) and (d) are correct

(a), (b) and (c) are correct

answer is A.

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Detailed Solution

Down’s syndrome is due to trisomy chromosome 21.
Klinefelter’s syndrome is due to trisomy of chromosome 23 (XXY).
Turner’s syndrome is due to monosomy of chromosome 23 (X0).
Edward’s syndrome is due to monosomy of chromosome 18.

Trisomy is a condition in which an individual has three copies of a particular chromosome, rather than the typical two copies. Monosomy is a condition in which an individual has only one copy of a particular chromosome, rather than the typical two copies. Nullisomy is a condition in which an individual is missing both copies of a particular chromosome. This can be lethal in some cases. Tetrasomy is a condition in which an individual has four copies of a particular chromosome, rather than the typical two copies. This is a rare condition.

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