CBSE 2026 · Region 1 · Set 1 · Q23 · 3 marks
(a)What is pedigree analysis ? Mention its importance in human genetics. ($\displaystyle 2$ pts.) (b)Analyse the following pedigree and write the(i)Pattern of inheritance.(ii)Give one example of disease showing such an inheritance pattern.
(a)
What is pedigree analysis ? Mention its importance in human genetics. ($\displaystyle 2$ pts.)
(b)
Analyse the following pedigree and write the
(i)
Pattern of inheritance.
(ii)
Give one example of disease showing such an inheritance pattern.
Marking-scheme solution
(a)
Pedigree analysis –It is analysis of traits or inheritance of traits in several generations of a family.
Importance : To trace the inheritance of a trait , abnormality or a disease.
(i)
Autosomal- Recessive
(ii)
Sickle Cell Anaemia / Thalassemia / Phenylketonuria /Any other correct example.
Principles of Inheritance and VariationGenetic DisordersAnalyseshort_answermedium
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CBSE Class 12 Biology past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.