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Principles of Inheritance and Variation Important Questions

12th Standard EM

    Reg.No. :


Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. Which of the following phenotypes in the progeny are possible from the parental combination AxB?


    A and B only


    A,B and AB only


    AB only


    A,B,AB and O

  2. Which of the following phenotypes is not possible in the progeny of the parental genotypic combination IAIO X IAIB?









  3. If the childs blood group is ‘O’ and fathers blood group is ‘A’ and mother’s blood group is ‘B’ the genotype of the parents will be


    IA IA and IB Io


    IA Io and IB Io


    IA Io and IoIo


    IoIo and IB IB

  4. The inheritance of blood group is determined by multiple alleles as discovered by _________.






    Alexander castelle



  5. The__________ is called null allele.









  6. 5 x 1 = 5
  7. Lyon

  8. (1)


  9. I

  10. (2)


  11. R1

  12. (3)


  13. Cde

  14. (4)

    Barr body

  15. X/A

  16. (5)


    5 x 2 = 10
  17. Why are sex linked recessive characters more common in the male human beings?

  18. What are holandric genes?

  19. Mention the symptoms of Phenylketonuria

  20. Mention two measures under negative eugenics

  21. Mention the symptoms seen in trisomy 13/ Pataus's syndrome.

  22. 5 x 3 = 15
  23. Explain male heterogamety

  24. Brief about female heterogamety

  25. Give an account of genetic control of Rh factor.

  26. Why are people with O blood group called as universal donors?

  27. 'AB' Blood group individuals are called universal recipients. Justify

  28. 3 x 5 = 15
  29. What is extra chromosomal inheritance? Explain with an example

  30. Comment on the methods of Eugenics.

  31. Explain criss-cross pattern of inheritance with an example. (or) Explain Inheritance of colour blindness.


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