Principles of Inheritance and Variation

Bihar Board Class 12 · Biology · 55 past questions

50 of 55 · show all

1. Q1 2026 Set A

   If a person's blood group is AB, what would be his / her genotype?

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2. Q2 2026 Set A

   How many types of gametes would be formed if the genotype of plant is AaBbCc ?

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3. Q3 2026 Set A

   Which of the following is not a chromosomal disorder?

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4. Q4 2026 Set A

   In which of the following animals does sex determination depend on number of chromosome sets ?

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5. Q5 2026 Set A

   Which of the following laws is based on monohybrid cross?

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6. Q6 2025

   Which of the following is the symbol for mating? (with a figure)

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7. Q7 2025

   Which of the following is not a chromosol disorder?

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8. Q8 2025

   In which of the following females heterogamety is found?

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9. Q9 2025

   The trait which is expressed in heterozygous plants is known as .......

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10. Q10 2025

    How many types of genotypes are there for ABO blood groups?

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11. Q11 2025

    Which of the following scientists prepared recombination map?

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12. Q12 2025

    Which laws of inheritance were propounded on basis of monohybrid?…

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13. Q13 2024 Set E

    In a cross between true breeding red flowered and true breeding white flowered plants of Antirrhinum the F1…

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14. Q15 2024 Set E

    What is the cytological basis of law of independent assortment?

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15. Q16 2024 Set E

    Who propounded the chromosomal theory of inheritance?

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16. Q17 2024 Set E

    Which of the following is not a chromosomal disorder?

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17. Q18 2023

    Which is the number of chromosomes in Turner's syndrome ?

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18. Q19 2023

    Sex chromosome of human beings are –

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19. Q20 2023

    The F$_2$ phenotypic ratio in dihybrid cross is –

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20. Q21 2023

    ‘Genotype-Phenotype’ concept was first proposed by

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21. Q22 2023

    “Gametes are never hybrid”, it is statement of -

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22. Q23 2023

    Which one in the following crosses shows phenotypic ratio of 3:1 ?

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23. Q24 2022 Set A

    It is an example of a quantitative trait in humans.

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24. Q25 2022 Set A

    The different forms of a gene are called.

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25. Q26 2021 Set H

    In which stage does crossing-over take place ?

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26. Q27 2021 Set H

    What is the number of chromosomes present in human gametes ?

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27. Q28 2021 Set H

    Mendel proposed

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28. Q29 2021 Set H

    Law of segregation is also known as

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29. Q30 2021 Set H

    Number of chromosomes in human being (male) is

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30. Q31 2021 Set H

    One gene pair hides the effect of another gene pair. This phenomenon is

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31. Q32 2021 Set H

    An exception of Mendel's law is

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32. Q33 2020

    What does the ABO blood group in humans indicate?

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33. Q34 2020

    How many chromosomes will there be in Turner's syndrome?

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34. Q35 2020

    In which organism is ZZ/ZW type of sex determination observed?

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35. Q36 2019

    The phenotypic ratio for F$_2$ generation in incomplete dominance is

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36. Q37 2019

    Describe the law of segregation with any one example. (with a figure)

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37. Q38 2019

    Comment upon Klinefelter syndrome

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38. Q40 2018

    Genes present on the same locus having different expression are called…

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39. Q41 2018

    Sickle cell anemia shows:-

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40. Q42 2018

    The trisomy of 21st chromosome causes…

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41. Q45 2018

    What do you mean by incomplete dominance? Explain with suitable example.

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42. Q46 2017

    Chromosome number in human being(male) is

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43. Q47 2017

    Which one is phenotypic ratio od Monohybrid cross?

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44. Q49 2016

    Human blood in group O

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45. Q50 2016

    Children become mentally retarded due to trisomy (2n + 1); what is it called?

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46. Q51 2016

    What is the phenotypic ratio of a dihybrid cross?

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47. Q52 2015

    What is the number of chromosomes present in human gametes?

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48. Q53 2015

    A person suffering from color blindness cannot recognise

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49. Q54 2015

    Mendel proposed

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50. Q55 2015

    Write Mendel's law based on monohybrid cross.

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