A) Haemophilic-Y- chromosome
B) Downs syndrome-21st chromosome
C) Sickle cell anaemia- X-chromosome
D) Parkinsons disease-X and Y- chromosome
Correct Answer: B
Solution :
Downs syndrome is caused due to non-disjunction of 21st chromosome during anaphase of meiosis, .i.e., trisomy of 21st chromosome (autosome). Symptoms are typically flat face, serve mental retardation, short stature, small skull, defective heart, coare straight hair etc.
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