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Pick out the correct statements : (...

Pick out the correct statements :
(a) Haemophilia is a sex-linked recessive disease.
(b) Down's syndrome is due to aneuploidy .
(c) Phenylketonuria is an autosomal recessive gene disorder .
(d) Sickle cell anaemia is an X - linked recessive gene disorder

A

(a) and (d) are correct

B

(b) and (d) are correct

C

(a), (c) and (d) are correct

D

(a), (b) and (c) are correct

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statements are correct regarding genetic disorders, we will analyze each statement one by one. ### Step-by-Step Solution: 1. **Statement (a): Haemophilia is a sex-linked recessive disease.** - Haemophilia is indeed a genetic disorder that is linked to the X chromosome. It is caused by a deficiency in a clotting factor, leading to excessive bleeding. Since the gene responsible for haemophilia is recessive and located on the X chromosome, this statement is **correct**. 2. **Statement (b): Down's syndrome is due to aneuploidy.** - Down's syndrome, also known as trisomy 21, occurs when there is an extra copy of chromosome 21. This condition is classified as an aneuploidy, which is an abnormal number of chromosomes. Therefore, this statement is also **correct**. 3. **Statement (c): Phenylketonuria is an autosomal recessive gene disorder.** - Phenylketonuria (PKU) is caused by a deficiency of the enzyme phenylalanine hydroxylase, leading to the accumulation of phenylalanine. This disorder is inherited in an autosomal recessive manner, meaning that two copies of the mutated gene (one from each parent) are necessary for the disorder to manifest. Thus, this statement is **correct**. 4. **Statement (d): Sickle cell anaemia is an X-linked recessive gene disorder.** - Sickle cell anaemia is caused by a mutation in the gene that encodes the beta-globin chain of hemoglobin, which is located on chromosome 11 (an autosome). It is not linked to the X chromosome, and it is inherited in an autosomal recessive manner. Therefore, this statement is **incorrect**. ### Conclusion: The correct statements are: - (a) Haemophilia is a sex-linked recessive disease. **(Correct)** - (b) Down's syndrome is due to aneuploidy. **(Correct)** - (c) Phenylketonuria is an autosomal recessive gene disorder. **(Correct)** - (d) Sickle cell anaemia is an X-linked recessive gene disorder. **(Incorrect)** ### Final Answer: The correct statements are (a), (b), and (c). ---
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