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Dominant and Recessive Alleles

A single rece...

Question

A single recessive trait, able to express must be on
(a) one Y chromosome
(b) one X chromosome
(c) autosome
(d) none of these

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Solution

(b) one X chromosome

Males have one X chromosome. Hence, they are more at risk of being affected by sex-linked diseases.

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Q. 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

Q. Which one of the following is caused by the expression of a recessive gene present on an chromosome?

Q. A single recessive trait, which can express its effect should occur on

Q. Match column I with column II and select the correct option from the given codes.

	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

Q. Phenylketonuria is autosomal recessive disorder of the chromosome

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