Which of the following mendelian disorders are autosome-linked recessive traits?
(A) Thalassaemia
(B) Colour Blindness
(C) Phenylketonuria
(D) Haemophilia
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A) and (C) only
(A) Thalassaemia — True. Autosome-linked recessive blood disease.
(B) Colour Blindness — False. Sex-linked recessive.
(C) Phenylketonuria — True. Autosomal recessive.
(D) Haemophilia — False. Sex-linked recessive.
NCERT Extract:
Mendelian Disorders – “… Thalassemia : This is also an autosome-linked recessive blood disease transmitted from parents to the offspring when both the partners are unaffected carrier for the gene (or heterozygous). The defect could be due to either mutation or deletion which ultimately results in reduced rate of synthesis of one of the globin chains (α and β chains) that make up haemoglobin.”