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JIPMER 2019
Exam
JIPMER
Year
2019
Subject
Zoology
Chapter
Principles of Inheritance and Variation

JIPMER 2019 · Zoology · Principles of Inheritance and Variation

Karyotype of Down's syndrome has how many chromosomes?

Karyotype of Down's syndrome has how many chromosomes?

Options

  1. A43
  2. B46
  3. C47
  4. D45

Correct answer

C. 47

Step-by-step solution

Karyotype of people suffering from Down's syndrome has 47 chromosomes ( 45+XY45+\mathrm{XY} in males, 45+XX45+\mathrm{XX} in females) instead of 46 . It is caused due to the presence of an extra chromosome number 21 , thus it is also known as 21 trisomy.
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