Q167 / 200 · NEET 2002 · Zoology

Which of the following is a correct match?

  • Correct answer
    A
    Down syndrome $=21^{\text {st }}$ chromosome
  • B
    Sickle cell anaemia $=\mathrm{X}$ chromosome
  • C
    Haemophilia = Y chromosome
  • D
    Parkinson disease $=\mathrm{X}$ and $\mathrm{Y}$ chromosomes

Solution

Down syndrome $=$ trisomy of $21^{\text {st }}$ chromosome Sickle cell anaemia $=$ autosomal recessive disorder, due to the mutation in $\beta$-globin gene of haemoglobin, on chromosome 11 Haemophilia $=$ Sex linked recessive disease, caused due to deficiency of clotting factor VII or IX Parkinson Disease $=$ caused by a loss of nerve cells in the part of the brain, that produce neurotransmitter dopamine

Hence, the correct answer is option: 'A'.

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