CBSE 2025 · Region 5 · Set 2 · Q26 · 3 marks
Name a blood related autosomal Mendelian disorder. Why is it called as Mendelian disorder ? How is the disorder transmitted from parents to offspring ?
Marking-scheme solution
• Sickle cell anaemia or Thalassemia
• It is determined by alteration or mutation in the single gene, these are transmitted
to the offspring on the same line as studied by Mendel in garden pea, Mendelian disorders can be traced in a family by the pedigree analysis.• It is transmitted from parents to offspring when both the partners are
carriers/heterozygous for the disease.
Principles of Inheritance and VariationGenetic DisordersUnderstandshort_answermedium
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CBSE Class 12 Biology past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.