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Pick out the correct statements: (i) Hae...

Pick out the correct statements: (i) Haemophilia is a sex-linked recissive 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.

A

(i) and (iv) are correct

B

(ii) and (iv) are correct

C

(i),(iii) and (iv) are correct

D

(i),(ii) and (iii) are correct

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze each statement one by one and determine whether they are correct or incorrect. ### Step 1: Analyze Statement (i) **Statement:** Haemophilia is a sex-linked recessive disease. **Analysis:** Haemophilia is indeed a sex-linked recessive disorder. It is associated with the X chromosome, and individuals with the recessive allele on their X chromosome will express the disease. Therefore, this statement is **correct**. ### Step 2: Analyze Statement (ii) **Statement:** Down's syndrome is due to aneuploidy. **Analysis:** Down's syndrome, also known as Trisomy 21, is caused by the presence of an extra chromosome 21 due to aneuploidy. This occurs due to nondisjunction during gamete formation. Therefore, this statement is **correct**. ### Step 3: Analyze Statement (iii) **Statement:** Phenylketonuria is an autosomal recessive gene disorder. **Analysis:** Phenylketonuria (PKU) is indeed an autosomal recessive disorder caused by a deficiency in the enzyme phenylalanine hydroxylase. Individuals must inherit two copies of the mutated gene to express the disorder. Therefore, this statement is **correct**. ### Step 4: Analyze Statement (iv) **Statement:** Sickle cell anaemia is an X-linked recessive gene disorder. **Analysis:** Sickle cell anaemia is actually an autosomal recessive disorder, not X-linked. It is caused by a mutation in the HBB gene on chromosome 11. Therefore, this statement is **incorrect**. ### Conclusion Based on the analysis: - Statement (i) is correct. - Statement (ii) is correct. - Statement (iii) is correct. - Statement (iv) is incorrect. Thus, the correct statements are (i), (ii), and (iii). ### Final Answer The correct statements are: (i), (ii), and (iii). ---
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