Principles of Inheritance and Variation MCQ Questions for Class 12 Biology Chapter 5 with Answers

Find here the NCERT chapter-wise Multiple Choice Questions from Class 12 Biology book Chapter 5 Principles of Inheritance and Variation with Answers Pdf free download. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Principles of Inheritance and Variation. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.

NCERT MCQ Chapters for Class 12 Biology

Q1. ZZ/ZW type of sex determination is seen in

(i) platypus
(ii) snails
(iii) cockroach
(iv) peacock

(iv) peacock

Q2. In the hexaploid wheat, the haploid (n) and basic (X) numbers of chromosomes are

(i) n = 7 and X = 21
(ii) n = 21 and X = 21
(iii) n = 21 and X = 7
(iv) n = 21 and X = 14

(iii) n = 21 and X = 7

Q3. The possibility of all genotypes of offspring in a genetic cross is calculated by a graphical representation which was developed by

(i) Komberg
(ii) T.H. Morgan
(iii) Gregor Mendel
(iv) Reginald Punnett

(iv) Reginald Punnett

Q4. If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is:

(i) Autosomal dominant
(ii) Autosomal recessive
(iii) Sex-linked dominant
(iv) Sex-linked recessive.

(iv) Sex-linked recessive.

Q5. Rh+ individual gene may be:

(i) rr
(ii) TT
(iii) Rr
(iv) Both (i) and (iii)

(iii) Rr

Q6. Person having genotype IA IB would show the blood group as AB. This is because of

(i) pleiotropy
(ii) co-dominance
(iii) segregation
(iv) incomplete dominance.

(ii) co-dominance

Q7. Haemophilia is due to

(i) Factor-VIII
(ii) Factor-VII
(iii) Factor-IX
(iv) Factor-VI

(i) Factor-VIII

Q8. From a cross AABb x aaBb, the genotypes AaBB : AaBb : Aabb will be obtained in the ratio

(i) 1:1:2
(ii) 1:2:1
(iii) 2:1:1
(iv) 2:1:2

(ii) 1:2:1

Q9. Distance between the genes and advantage of recombination shows:

(i) a direct relationship
(ii) an inverse relationship
(iii) a parallel relationship
(iv) no relationship.

(i) a direct relationship

Q10. Gunetical identification of male human is:

(i) By Nucleus
(ii) By cells
(iii) By Autosome
(iv) By Sex-chromosome

(iv) By Sex-chromosome

Q11. In sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplets codes for valine ?

(i) GGG
(ii) A AG
(iii) G A A
(iv) GUG

(iv) GUG

Q12. Turner syndrome is

(i) XYY
(ii) XO
(iii) XXX
(iv) XXY

(ii) XO

Q13. When ‘Aa’ is crossed with ‘aa’, (A is dominant over a)

(i) all the offspring will have dominant phenotype.
(ii) all the offspring will have recessive phenotype.
(iii) 50% of offspring will have dominant phenotype and 50% will have recessive phenotype.
(iv) 75% of offspring will have dominant phenotype and 50% will have recessive phenotype.

(iii) 50% of offspring will have dominant phenotype and 50% will have recessive phenotype.

Q14. Conditions of a karyotype 2n + 1 and 2n ± 2 are called:

(i) Aneuploidy
(ii) Polyploidy
(iii) Allopolyploidy
(iv) Monosomy.

(i) Aneuploidy

Q15. Loss of Melanin pigment cause for:

(i) Colourblindness
(ii) Depigmentation
(iii) Phenyl Ketoneuria
(iv) Alkaptoneuria

(ii) Depigmentation

Q16. If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is

(i) autosomal dominant
(ii) autosomal recessive
(iii) sex-linked dominant
(iv) sex-linked recessive.

(iv) sex-linked recessive.

Q17. In order to find out the different types of gametes produced by a pea plant having the genotype AaBb, it should be crossed to a plant with the genotype:

(i) AABB
(ii) AaBb
(iii) aabb
(iv) aaBB

(iii) aabb

Q18. A woman with normal vision has a colorblind father. She marries a colourblind man. What proportion of their children will be colourblind?

(i) 0%
(ii) 25%
(iii) 50%
(iv) 100%

(iii) 50%

Q19. All genes located on the same chromosome:

(i) form different groups depending upon their relative distance
(ii) form one linkage group
(iii) will not form any linkage groups
(iv) form interactive groups that affect the phenotype

(ii) form one linkage group

Q20. Sucess of mendal is

(i) Selection of Peaplant
(ii) Studied of free characters
(iii) More Characters selection
(iv) Pea is Bisexual

(i) Selection of Peaplant

Q21. Which of the following will not result in variations among siblings ?

(i) Independent assortment of genes
(ii) Crossing over
(iii) Linkage
(iv) Mutation

(iii) Linkage

Q22. Which of the following terms represent a pair of contrasting characters?

(i) Homozygous
(ii) Co-dominant genes
(iii) Heterozygous
(iv) Allelomorphs

(iv) Allelomorphs

Q23. Occasionally, a single gene may express more than one effect. The phenomenon is called

(i) multiple allelism
(ii) mosaicism
(iii) pleiotropy
(iv) polygeny.

(iii) pleiotropy

Q24. A strong mutagen is:

(i) Cold
(ii) Heat
(iii) Water
(iv) X-rays

(iv) X-rays

Q25. Mendal was born in:

(i) 17th century
(ii) 18th century
(iii) 19th century
(iv) 8th century

(i) 17th century

Q26. Mendel’s Law of independent assortment holds good for genes situated on the

(i) non-homologous chromosomes
(ii) homologous chromosomes
(iii) extra nuclear genetic element
(iv) same chromosome.

(ii) homologous chromosomes

Q27. Point mutation involves

(i) Change in single base pair
(ii) Deletion
(iii) Insertion
(iv) Duplication

(i) Change in single base pair

Q28. Conditions of a karyotype 2n ± 1 and 2n ± 2 are called

(i) Aneuploidy
(ii) Polyploidy
(iii) Allopolyploidy
(iv) Monosomy.

(i) Aneuploidy

Q29. Mendel’s law of independent assortment holds good for genes situated on the :

(i) non-homologous chromosomes
(ii) homologous chromosomes
(iii) extra nuclear genetic element
(iv) same chromosome.

(i) non-homologous chromosomes

Q30. Two genes very close on a chromosome will show:

(i) No crossing over
(ii) High crossing over
(iii) Hardly an crossing over
(iv) Only double crossing overy

(i) No crossing over

Q31. The colour based contrasting traits in seven contrasting pairs, studied by Mendel in pea plant were

(i) 1
(ii) 2
(iii) 3
(iv) 4

(iii) 3

Q32. Mutations which arise suddenly in nature are called

(i) Spontaneous mutations
(ii) Gene mutations
(iii) Induced mutations
(iv) Chromosomal mutations

(i) Spontaneous mutations

Q33. If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is

(i) Autosomal dominant
(ii) Autosomal recessive
(iii) Sex-linked dominant
(iv) Sex-linked recessive.

(iv) Sex-linked recessive.

Q34. The inheritance pattern of a gene over generations among humans is studied by the pedigree analysis. Character studied in the pedigree analysis is equivalent to :

(i) quantitative trait
(ii) Mendelian trait
(iii) polygenic trait
(iv) maternal trait.

(ii) Mendelian trait

Q35. An lndividual with into identical alleles is:

(i) Hybrid
(ii) Dominant
(iii) Homozygous
(iv) Heterozygous

(iii) Homozygous

Q36. Which of the following characters was not chosen by Mendel ?

(i) Pod shape
(ii) Pod colour
(iii) Location of flower
(iv) Location of pod

(iv) Location of pod

Q37. Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child ?

(i) Two X chromosomes
(ii) Only one Y chromosome
(iii) Only one X chromosome
(iv) One X and one Y chromosome

(i) Two X chromosomes

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