CBSE Class 12 Biology Principles of Inheritance and Variation (1). CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.
1.Name one autosomal dominant and one autosomal recessive Mendelian disorder in humans.
2.Write the genotype of i) an individual who is carrier of sickle cell anaemia gene but apparently unaffected, and ii) an individual affected with the disease.
3.A human being suffering from Down’s syndrome shows trisomy of 21st chromosome. Mention the cause of this chromosomal abnormality.
4.Write the percentage of F2 homozygous and heterozygous populations in a typical monohybrid cross.
5.A man with blood group A married a woman with B group. They have a son with AB blood group and a daughter with blood group O. Workout the cross and show the possibility of such inheritance.
6.The male fruit fly and female fowl are heterogametic while the female fruit fly and male fowl are homogametic. Why are they called so?
7.A plant of Antirrhinum majus with red flowers was crossed with another plant of the same species with white flowers. The plants of the F1 generation bore pink flowers. Explain the pattern of inheritance with the help of a cross.
8.A woman with blood group ‘O’ married a man with AB group. Show the possible blood groups of the progeny. List the alleles involved in this inheritance.
9.How does a test cross help in identifying the genotype of the organism? Explain.
10.When a tall pea plant was selfed, it produced one fourth of its progeny as dwarf. Explain with the help of a cross.
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