A single recessive trait, able to express must be on
(a) Y chromosome
(b) X chromosome in male
(c) X chromosome in female
(d) autosome

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Solution

(b) X chromosome in male

As males have only one X chromosome, the trait present on it is always expressed. So, a single recessive trait can be expressed only when it is present on X chromosomes in males.

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Similar questions

	Column I		Column II
A.	Autosomal recessive trait	(i)	Downs syndrome
B.	Sex-linked recessive trait	(ii)	Phenylketonuria
C.	Metabolic error linked to autosomal recessive trait	(iii)	Haemophilia
D.	Additional 21st chromosome	(iv)	Sickle cell anaemia

Any trait that is carried by the Y chromosome can neither be dominant, nor recessive.

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