NEET Biology question

Down's syndrome and Turner's syndrome occur in human beings due to

(A)Monosomic and nullisomic conditions respectively
(B)Monosomic and trisomic conditions respectively
(C)Trisomic and monosomic conditions respectivelyCorrect
(D)Trisomic and tetrasomic conditions respectively

Answer: (C)

Solution

Down's syndrome is caused by trisomy of chromosome 21 (an extra copy, ), while Turner's syndrome is caused by monosomy of the X-chromosome (a missing copy, , giving karyotype

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Question ID VK-119650