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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
Detailed Solution
These are features of Down's syndrome, caused by the presence of an additional copy of chromosome 21 (trisomy 21, 2n + 1). This aneuploidy results from non-disjunction during gamete formation.