CBSE 2025 · Region 5 · Set 3 · Q25 · 3 marks
Name one commonly occurring genetic disorder in humans which is caused due to monosomy (one chromosome less than the normal number of chromosomes) of sex chromosome. Give its two symptoms.
Marking-scheme solution
Turner’s syndrome
Such females are sterile, ovaries are rudimentary, lack of secondary sexual characters,
short-statured, underdeveloped feminine characterPrinciples of Inheritance and VariationSex DeterminationRemembershort_answereasy
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CBSE Class 12 Biology past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.