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Biology · 2025 · 2 marks
CBSE 2025 · Region 7 · Set 1 · Q21
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…
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.
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