✓ Board-verified
Biology · 2025 · 2 marks
CBSE 2025 · Region 2 · Set 2 · Q18
(a) Write two closely linked genes that control α -thalassemia. (b) Differentiate between thalassemia and sickle cell anaemia on the basis of their…
(a)
Write two closely linked genes that control $\displaystyle \alpha$-thalassemia.
(b)
Differentiate between thalassemia and sickle cell anaemia on the basis of their effect on globin molecule of Haemoglobin.
Marking-scheme solution
(a)
HBA$\displaystyle 1$ , HBA$\displaystyle 2$
(b)
Thalassemia is a quantitative problem of synthesising too few globin molecules, while Sickle cell anaemia is a qualitative problem of synthesising an incorrectly functioning globin molecule
All Principles of Inheritance and Variation questions2025 question paperNCERT solutions: Principles of Inheritance and VariationPractice Principles of Inheritance and Variation →
More from Principles of Inheritance and Variation
- In which of the given chromosomal disorders does the individual have tall stature with feminised character?2024
- In the following figure, two ways of pairing of two homologous pairs of chromosomes are shown. Which of the following phenomena is expressed?2026
- Study the pedigree chart of a family given below and answer the questions that follow: Is the disease in this pedigree chart a recessive or dominant…2023
- Study the figures given below and answer the questions. Cross - A Cross - B Identify in which of the crosses the strength of linkage between the…2026
- Inheritance of which of the following traits is shown in the cross given below? Choose the correct option from the following:2025
- If both the parents are carriers for thalassaemia, the chances of an afflicted child to be born to them is:2024
- Which of the following is correct for the condition when plant YyRr is back crossed with the double recessive parent?2025
- Which of the following features correctly show the mechanism of sex- determination in honey-bees? (i) A zygote formed from the union of a sperm and…2025
CBSE Class 12 Biology past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.