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

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 4. principal of inheritance and variation1 Mark
MCQ
A human female with Turner’s syndrome
  • ✓
    has $45$ chromosomes with $XO$
  • B
    has one additional $X$ chromosome
  • C
    exhibits male characters
  • D
    is able to produce children with normal husband.
✓

Answer

Correct option: A.
has $45$ chromosomes with $XO$
a
(a): A human female with Turner’s syndrome has single sex chromosome $i.e., 44 + X0 (45)$. Such females are called sterile females with rudimentary ovaries. Other associated phenotypes of this condition are short stature, webbed­neck, broad chest, lack of secondarysexual characteristics and sterility. Thus, any imbalance in the copies of the sex chromosomes may disrupt the genetic information necessary for normal sexual development.

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