Multiple choice

__________ of the sex chromosomes leads to the Turner syndrome.

  1. Monosomy

  2. Disomy

  3. Trisomy

  4. Tetrasomy

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A Correct answer
Explanation

Monosomy refers to lack of one chromosome of the normal complement. Partial monosomy can occur in unbalanced translocations or deletions, in which only a portion of the chromosome is present in a single copy. Monosomy of the sex chromosomes (45X) causes Turner syndrome.