CBSE Class 12 Biology Principles Of Inheritance And Variation Worksheet Set A

CBSE Class 12 Biology Worksheet - Principles of Inheritance and Variation : Molecular Basis of Inheretance. 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.

Principles of Inheritance and Variation : Molecular Basis of Inheretance

1. Define heredity, genetics, and inheritance.

2. Why did Mendel select pea plant for his experiments?

3. How did Mendel make sure that the pea plants were true breeding?

4. List the traits in garden pea plant which Mendel studied in his breeding experiments.

5. What is emasculation technique?

6. Define the following terms:

(i) Allele                        (ii) homozygous

(iii) Heterozygous          (iv) Dominant gene

(v) Recessive gene        (vi) Genotype

(vii) Phenotype

7. (a) What is monohybrid cross? How did Mendel carry out this cross? Show with help of Punnet square.

(b) Explain Law of Dominance.

(c) Explain Law of Segregation of gametes.

8. What kind of gametes would be produced by the organisms having the following genotypes?

(i) AaBB

(ii) aaBB

(iii) Aabb

(iv) AaBBCc

9. In human beings, blue eye colour is recessive to brown eye colour. A brown-eyed man has a blueeyed mother.

(a) What is the genotype of the man and his mother?

(b) What are the possible genotypes of his father?

(c) If a man marries a blue-eyed woman, what are the possible genotypes of their offspring?

10. What is test cross? Give its use.

11. In dogs black coat colour is dominant over white. What coloured dog will you choose to breed a given black dog to find its genotype? What is this type of cross known as?

12 (a) What is incomplete dominance? Describe one example of incomplete dominance.

(b) What is the difference between dominance and incomplete dominance?

13. What is multiple allelism? Give its suitable example.

14. What is codominance? Give suitable example.

15. How is codominance different from incomplete dominance?

16 (a) Describe briefly the dihydrid cross conducted by Mendel.

(b) State the Law of Independent Assortment.

17. State the reasons for which the published work for Mendel remained unrecognized for several years.

18. Who proposed the chromosome theory of inheritance? Give the salient features of this theory.

19. Why did Morgan select Drosophilia for his experiments?

20. What is linkage? Describe briefly the two types of linkage.

21. State the relationship between linkage and crossing over.

22. Briefly mention the contribution of T.H.Morgan in genetics.

23. What is the role of Henking in discovery of X-chromosome?

24. What are autosomes and sex chromosomes?

25. discuss briefly different types of sex determination

(a) XO-XX type      (b) XX-XY type     (c) ZW-ZZ type

26. What is male heterogamety and female heterogamety?

27. Define mutation and mutagens.

28. What is point mutation and chromosomal mutations?

29. What is pedigree analysis? What are the symbols used in such an analysis?

30. Give the use of pedigree analysis.

31. What is haemophilia? Why do generally only human males suffer from haemophilia? Can women also suffer? Explain

32. How is sickle cell anaemia caused? What are its symptoms?

33. Write short note on Phenylketouria.

34. What is aneuploidy? Differentiate between trisomic and haploid condition.

CBSE Class 12 Biology Worksheet - Principles of Inheritance and Variation : Molecular Basis of Inheretance.

Tags: 

 


Click to View or Download pdf file
Click for more Biology Study Material

Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

Cogito and The Question Book A series on Thinking skills by CBSE

The Board has dedicated this academic session 2020-21 for ‘Competency Based Learning’. Skills connected to Critical & Creative thinking, Problem Solving, Collaboration and Communication are core to successful living in the 21st Century. To focus on the importance...

FAQs CBSE Board Exam Results Class 10 and 12

FAQs CBSE Board Exam Results Class 10 and 12 Q.1. What does the term RT in the marksheet mean? Ans.The term RT means REPEAT IN THEORY. This is the term used from 2020 instead of FAIL IN THEORY(FT) Q.2. What does the term RP in the marksheet mean? Ans.The term RP means...

CBSE Reduced Syllabus Class 11 and 12

CBSE has announced major reduction in the syllabus for class 11 and class 12. There has been major changes too in the main syllabus for class 11 and 12. The prevailing health emergency in the country and at different parts of the world as well as the efforts to contain...

CBSE Reduced Syllabus Clarification

CBSE board has issued the following clarification relating to various news reports regarding reduction in syllabus and questions from the reduced syllabus during board exams. Please read below: It has come to notice of the Board through a section of media reports that...

Board Cancelled Official CBSE Statement

Keeping in view the requests received from various State Governments and the changed circumstances as on date, following has been decided- 1. Examinations for classes X and XII which were scheduled from 1st July to 15th, 2020 stand cancelled. 2. Assessment of the...

Re verification of Class 12 Board Exams Marks

Modalities and Schedule for Senior Secondary School (Class XII) Examinations, 2020 in the subjects whose examinations have been conducted by CBSE for the processes of (I) Verification of Marks (II) Obtaining Photocopy of the Evaluated Answer Book(s) (Ill) Re-evaluation...

×
Studies Today