The chromosomal disorders are caused due to absence, excess or abnormal arrangement of one or more chromosomes. Failure of segregation of chromatids during cell division results in the gain or loss of chromosome(s), called aneuploidy.

The disorder shown in the figure is caused due to:

Gain of extra 'X' chromosome Loss of 'Y' chromosome Loss of an autosome Gain of an autosome

Gain of an autosome

The correct answer is Option (4) → Gain of an autosome