NEET 2016 Biology question
Pick out the correct statements: (i) Hemophilia 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
Answer: (4)
Solution
Statement (i) is correct - hemophilia is a sex-linked (X-linked) recessive disease. Statement (ii) is correct - Down's syndrome is trisomy of chromosome 21, a gain of a single chromosome, which is aneuploidy. Statement (iii) is correct - phenylketonuria is an autosomal recessive inborn error of metabolism (lack of the
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