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.
NEET UG 2022 — Zoology Principles of Inheritance and Variation
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 :
Held on 30 Apr 2022 · Verified 9 Jul 2026.
47 chromosomes with XXY sex chromosomes
45 chromosomes with XO sex chromosomes
47 chromosomes with XYY sex chromosomes
Trisomy of chromosome 21
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What is the pattern of inheritance for polygenic trait?
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