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Which of the following is an example of trisomy ________________

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Which of the following is an example of trisomy ________________

(a) Endosperm

(b) Klinefelter

(c) Turner

(d) Xeroderma

This question was addressed to me in an online interview.

This intriguing question comes from Chromosomal Abnormalities : Aneuploidy topic in division Chromosomal Basis of Inheritance of Cytogenetics

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Right answer is (b) Klinefelter

To explain I would say: Klinefelter syndrome results from trisomy in sex chromosome producing 44+ XXY. Turner is due to monosomy, endosperm is triploid i.e. the complete set of chromosome is increased and XP is due to mutation or deletion in gene not entire chromosome.

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