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NEET2022ZoologyPrinciples of Inheritance and VariationActual

If a female individual is with small round head, furrowed tongue, partially open mouth and broad palm with characteristic palm crease. Also the physical, psychomotor and mental development is retarded. The karyotype analysis of such an individual will show :

Options

  1. A47 chromosomes with X X Y sex chromosomes
  2. B45 chromosomes with XO sex chromosomes
  3. C47 chromosomes with XYY sex chromosomes
  4. DTrisomy of chromosome 21

Correct answer

D. Trisomy of chromosome 21

Step-by-step solution

The symptoms mentioned in the question are of down's syndrome which is caused by trisomy of chromosome 21 . Total chromosome number turn to be 47 . It is also called Mongoloid Idiocy.

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