Biology - Principles of Inheritance and Variation Question with Solution | TestHub
Match the disorders inList Iwith their causes inList IIand choose the correct option.
| List I | List II |
|---|---|
| (A) Thalassemia. | (I) non-disjunction of sex chromosomes. |
| (B) Sickle-cell anaemia. | (II) non-disjuction of 21st pair of chromosomes. |
| (C) Turner's Syndrome. | (III) Synthesising few globin molecules. |
| (D) Down's Syndrome. | (IV) synthesising an incorrectly functional globin. |
Options:
Answer:
Solution:
Thalassemia is a quantitative blood disorder that results in the synthesis of too few globin molecules. Thus, (A) matches (III).
Sickle-cell anaemia is a qualitative blood disorder that results in the synthesis of an incorrectly functioning globin molecule. Thus, (B) matches (IV).
Turner's Syndrome is caused by the absence of one of the X chromosomes ( with ), which occurs due to the non-disjunction of sex chromosomes during gametogenesis. Thus, (C) matches (I).
Down's Syndrome is caused by the presence of an additional copy of chromosome number (trisomy of ), which occurs due to the non-disjunction of the st pair of chromosomes. Thus, (D) matches (II).
The correct matching is (A) - (III), (B) - (IV), (C) - (I), (D) - (II).
Answer: (A) - (III), (B) - (IV), (C) - (I), (D) - (II).
