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A couple has two sons and two daughters. Only one son is colour blind and the rest of the siblings are normal. Assuming colour blindness is sex-linked, which ONE of the following would be the phenotype of the parents?
(a)Mother would be colour blind, father would be normal
(b)Father would be colour blind, mother would be normal
(c)Both the parents would be normal
(d)Both the parents would be colour blind

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Important Questions on Principles of Inheritance and Variation
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(i) Haemophilia is a sex-linked recessive disease.
(ii) Down's syndrome is due to aneuploidy.
(iii) Phenylketonuria is an autosomal recessive gene disorder.
(iv) Sickle cell anaemia is an X-linked recessive gene disorder.

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Statement (S): The heterozygous individuals for sickle-cell anaemia express disease phenotype and also carriers of the disease.
Reason (R): genotype individuals are resistant to severe effects of malaria.
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