A) Nullisomy
B) monosomy
C) trisomy
D) autosomy
Correct Answer: C
Solution :
Mongoloid condition is related with 21st trisomy. Downs syndrome is characterised by 21st trisomy which is common in children and is characterised by mental retardation, a short body, swollen tongues and eyelid folds resembling those of mongolian races. Turners syndrome (44+X) is monosomy. Monosomic is an aneuploid in which a chromosome is deficient of its homologue causing genetic imbalance resulting in weaker than normal form. Monosomic is formed by the union of deficient gamete (\[n\]-1) and normal gamete. Nullisomic is an aneuploid in which a pair of homologous chromosomes is deficient (2\[n\]-2) resulting in absence of certain genes. It is produced by the union of two gametes deficient in the same chromosome \[(n-1)\times (n-1)\].
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