CBSE Class 12 Biology Principles of Inheritance and Variation (2). 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.
a) Is the trait recessive or dominant?
b) Is the trait sex- linked or autosomal?
c) Give the genotypes of the parents in generation I and of their third and fourth child in generation II.
2 Recently a girl baby has been reported to suffer from haemophilia. How is it possible? Explain with the help of a cross.
3 In one family each of the four children has a different blood group. Their mother is group A and the father is group B. Explain this pattern of inheritance with the help of a cross along with the genotypes.
4 Why are F2 phenotypic and genotypic ratios same in a cross between red-flowered snapdragon and white-flowered snapdragon plants. Explain with the help of a cross.
5 Workout a cross between true breeding red and white flowered dog-flower plants ( Snapdragon) up to F2 progeny. Explain the results of F1 and F2 generations.
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