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STD 12 - 4. principal of inheritance and variation — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYSTD 12 - 4. principal of inheritance and variation1 Mark
MCQ
$XO-$ chromosomal abnormality in human beings causes
  • ✓
    Turner’s syndrome
  • B
    Down’s syndrome
  • C
    Klinefelter’s syndrome
  • D
    none of the above
✓

Answer

Correct option: A.
Turner’s syndrome
a
Turner's syndrome is caused due to the missing $X$ chromosome. The genotype is therefore $XO$ instead of the normal $XX$ and the sufferer person possesses $45$ chromosomes instead of $46$. Patients with this condition can best be described as incompletely developed females, although there are often no obvious external differences compared with normal females. Affected females lack ovaries so they are infertile.

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