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Tritanopia is which of these in terms of prevalence?

  • A.very rare, affecting a small fraction of one per cent
  • B.much the commonest form of colour vision deficiency there is
  • C.affecting about eight per cent of men
  • D.present in about half the population

Answer: A

The S cone gene lies on chromosome seven rather than the X chromosome. Its inheritance is therefore autosomal and it affects both sexes equally. The S cone gene sits on chromosome seven. Its inheritance is autosomal rather than sex linked.

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