CBSE Class 12 Biology Worksheet - Revision (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.
Q A Fill in the blanks using suitable words:
1 Replication of DNA takes place in __ to ____ direction.
2 AUG Codon codes for ______________.
3 ____ _____ and _______ are examples of nonsense codon..
4 Scientific name of a Fruitfly is __________________
5 Females having sex chromosome as XO is said to be suffering from _________ ________.
Q B Answer the following questions in brief:
1 Who is the father of Genetics?
2 What is the scientific name of the plant used to give out “Laws of inheritance”?
3 What is the phenotypic ratio of a dihybrid cross in F2 generation?
4 Name the pattern of inheritance where the genotypic and phenotypic ratio of a cross comes out to be same in F2 generation.
5 Name the disorder observed in a female, when one of her sex chromosome is missing.
6 What is the phenotypic ratio of a test cross?
7 Who gave an experimental proof of the fact that the DNA replication is semi conservative?
8 What is the number of chromosomes in a man suffering from Knilefelter’s syndrome?
Q C Define the following term
2 Genetic codon
3 Homologous organs
Q D Answer the following questions in detail with the help of diagram.
1 Explain Hardy –Weinberg principle with the help of diagram showing operation of natural selection.
2 Explain the steps of protein synthesis
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