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4.Principles of Inheritance and Variation
medium
Pick out the correct statements.
$I.$ Haemophilia is a sex-linked recessive disease
$II.$ Down's syndrome is due to aneuploidy
$III.$ Phenylketonuria is an autosomal dominant gene disorder
$IV.$ Phenylketonuria is an autosomal recessive gene disorder
$V.$ Sickle cell anaemia is an $X$-linked recessive gene disorder
A
$I, III$ and $V$ are correct
B
$I$ and $III$ are correct
C
$II$ and $V$ are correct
D
$I, II$ and $IV$ are correct
Solution
Haemophilia or Bleeder's disease is a sex linked ($X$-linked recessive) disease. Down's syndrome is caused due to trisomy of chromosome $21$ ($i.e.,$ hyperploidy type of aneuploidy). Phenylketonuria is an autosomal recessive gene disorder.
Sickle cell anaemia in human, is also inherited as an autosomal recessive disorder.
Standard 12
Biology
