Read the paragraph and answer the question.
Broadly, genetic disorders may be grouped into two categories - Mendelian disorders and Chromosomal disorders. Mendelian disorders are mainly determined by alteration or mutation in the single gene. These disorders are transmitted to the offspring on the same lines as we have studied in the principle of inheritance. The trait may also be linked to the sex chromosome as in case of haemophilia. It is evident that this X-linked recessive trait shows transmission from carrier female to male progeny.
Match List - I with List - II.
| List - I | List - II |
|---|---|
| (A) Autosomal dominant trait | (I) Klinefelter's Syndrome |
| (B) Autosomal recessive trait | (II) Sickle Cell Anaemia |
| (C) Sex linked recessive trait | (III) Myotonic Dystrophy |
| (D) Gain of chromosomes | (IV) Haemophilia |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A)-(III), (B)-(II), (C)-(IV), (D)-(I)
(A) Autosomal dominant trait — this matches (III) Myotonic Dystrophy. NCERT gives it as the example of an autosomal dominant pedigree.
(B) Autosomal recessive trait — this matches (II) Sickle Cell Anaemia. Only HbSHbS individuals show the disease.
(C) Sex linked recessive trait — this matches (IV) Haemophilia. The gene is on the X chromosome; carrier mothers pass it to sons.
(D) Gain of chromosomes — this matches (I) Klinefelter's Syndrome. An extra X chromosome (47, XXY).
Note: The passage is taken from NCERT. NTA has put lines of the NCERT text together to make it. Most CUET (UG) questions come straight from NCERT, so study the book line by line, including figures and their titles.