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

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NCERT MCQ Chapters for Class 12 Biology


Q1. A strong mutagen is:

(A) Cold
(B) Heat
(C) Water
(D) X-rays


(D) X-rays


Q2. ZZ/ZW type of sex determination is seen in

(A) platypus
(B) snails
(C) cockroach
(D) peacock


(D) peacock


Q3. Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child ?

(A) Two X chromosomes
(B) Only one Y chromosome
(C) Only one X chromosome
(D) One X and one Y chromosome


(A) Two X chromosomes


Q4. In the hexaploid wheat, the haploid (n) and basic (X) numbers of chromosomes are

(A) n = 7 and X = 21
(B) n = 21 and X = 21
(C) n = 21 and X = 7
(D) n = 21 and X = 14


(C) n = 21 and X = 7


Q5. Which of the following characters was not chosen by Mendel ?

(A) Pod shape
(B) Pod colour
(C) Location of flower
(D) Location of pod


(D) Location of pod


Q6. The possibility of all genotypes of offspring in a genetic cross is calculated by a graphical representation which was developed by

(A) Komberg
(B) T.H. Morgan
(C) Gregor Mendel
(D) Reginald Punnett


(D) Reginald Punnett


Q7. An lndividual with into identical alleles is:

(A) Hybrid
(B) Dominant
(C) Homozygous
(D) Heterozygous


(C) Homozygous


Q8.If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is:

(A) Autosomal dominant
(B) Autosomal recessive
(C) Sex-linked dominant
(D) Sex-linked recessive.


(D) Sex-linked recessive.


Q9. 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 :

(A) quantitative trait
(B) Mendelian trait
(C) polygenic trait
(D) maternal trait.


(B) Mendelian trait


Q10. Rh+ individual gene may be:

(A) rr
(B) TT
(C) Rr
(D) Both (A) and (iii)


(C) Rr


Q11. If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is

(A) Autosomal dominant
(B) Autosomal recessive
(C) Sex-linked dominant
(D) Sex-linked recessive.


(D) Sex-linked recessive.


Q12. Person having genotype IA IB would show the blood group as AB. This is because of

(A) pleiotropy
(B) co-dominance
(C) segregation
(D) incomplete dominance.


(B) co-dominance


Q13. Mutations which arise suddenly in nature are called

(A) Spontaneous mutations
(B) Gene mutations
(C) Induced mutations
(D) Chromosomal mutations


(A) Spontaneous mutations


Q14. Haemophilia is due to

(A) Factor-VIII
(B) Factor-VII
(C) Factor-IX
(D) Factor-VI


(A) Factor-VIII


Q15. The colour based contrasting traits in seven contrasting pairs, studied by Mendel in pea plant were

(A) 1
(B) 2
(C) 3
(D) 4


(C) 3


Q16. From a cross AABb x aaBb, the genotypes AaBB : AaBb : Aabb will be obtained in the ratio

(A) 1:1:2
(B) 1:2:1
(C) 2:1:1
(D) 2:1:2


(B) 1:2:1


Q17. Two genes very close on a chromosome will show:

(A) No crossing over
(B) High crossing over
(C) Hardly an crossing over
(D) Only double crossing overy


(A) No crossing over


Q18. Distance between the genes and advantage of recombination shows:

(A) a direct relationship
(B) an inverse relationship
(C) a parallel relationship
(D) no relationship.


(A) a direct relationship


Q19. Mendel’s law of independent assortment holds good for genes situated on the :

(A) non-homologous chromosomes
(B) homologous chromosomes
(C) extra nuclear genetic element
(D) same chromosome.


(A) non-homologous chromosomes


Q20. Conditions of a karyotype 2n ± 1 and 2n ± 2 are called

(A) Aneuploidy
(B) Polyploidy
(C) Allopolyploidy
(D) Monosomy.


(A) Aneuploidy


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