CBSE 2025 · Region 7 · Set 1 · Q21 · 2 marks
A karyotype of a human suffering from a certain disorder is given below :
(a)Identify the disorder.(b)Write the symptoms of the disorder.(c)Give reason for such a disorder.
A karyotype of a human suffering from a certain disorder is given below :
(a)
Identify the disorder.
(b)
Write the symptoms of the disorder.
(c)
Give reason for such a disorder.
Marking-scheme solution
(a)
Klinefelter’s syndrome
(b)
Development of breasts or Gynaecomastia / underdeveloped masculine character/ sterility/ tall stature with feminised character.
(c)
Aneuploidy/ Non disjunction or Failure of segregation of chromatids during cell division results in gain of extra X chromosome in male / trisomy of sex chromosome.
Principles of Inheritance and VariationSex DeterminationUnderstandvery_short_answermedium
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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.