Principles of Inheritance and Variation
Class 12th Biology Chapter 5 Objective in English : Here you can find class 12th biology Objective questions for board exam 2024. Principles of Inheritance and Variation objective questions is very important for board exam 2023 – 2024. mcq questions for class 12th biology chapter 5 in english. important question website
12th Biology Chapter 5 Objective Questions in English
1. An individual with two identical alleles is :
(A) Hybrid
(B) Dominant
(C) Homozygous
(D) Heterozygous
2. Law of segregation is also known as:
(A) Law of dominance
(B) Law of independent assortment
(C) law of purity of gametes
(D) none of these
3. In human blood group AB :
(A) antibodies are present
(B) antibodies are absent
(C) antibody a is present
(D) antibody b is present
4. ZZ ⁄ ZW type of sex determination is seen in :
(A) platypus
(B) snails
(C) cockroach
(D) peacock
5. Triticum aestivum is :
(A) Triploid
(B) Tetraploid
(C) Hexaploid
(D) Diploid
6. Tumer’s syndrome will contain how many chromosomes ?
(A) 45
(B) 46
(C) 47
(D) None of these
7. The term “Genetics’ was proposed by:
(A) Mendel
(B) Morgan
(C) Beteson
(D) Johansen
8. What is the number of chromosomes in Down’s syndrome ?
(A) 46
(B) 47
(C) 48
(D) None of these
9. ‘ABO’ blood group in human beings shows :
(A) incomplete dominance
(B) multiple allele
(C) co-dominance
(D) both (B) and (C)
10. How many characters were studied by Mendel ?
(A) Five
(B) Four
(C) Seven
(D) Three
11. The phenotypic ratio for F2generation in Incomplete dominance is :
(A) 3:1
(B) 2 : 2
(C) 1:2:1
(D) None of these
12. Sickle cell is :
(A) An autosomal dominant trait
(B) Occurrence of Sickle like nucleated RBCs.
(C) Change in a single base pair of DNA
(D) None of these
13. What is considered as father of genetics ?
(A) Hugo de Vries
(B) Morgan
(C) Mendel
(D) Darwin
14. A person suffering from colour blindness cannot recognise :
(A) red and yellow colours
(B) red and green colours
(C) blue and green colours
(D) none of these
15. Mendel proposed :
(A) law of linkage
(B) 10% energy law
(C) laws of inheritance
(D) none of these
16. Which of the following Mendel’s Law is not universal ?
(A) Law of Dominance
(B) Law of Segregation
(C) Law of Independent Assortment
(D) None of these
17. Loss of Melanin pigment cause for :
(A) Colourblindness
(B) Depigmentation
(C) Phenyl Ketoneuria
(D) Alkaptoneuria
18. Mendel selected :
(A) Gram
(B) Pinus
(C) Tomato
(D) Garden pea
19. Mendal was born in :
(A) 17th century
(B) 18th century
(C) 19th century
(D) 8th century
20. First geneticist/father of genetics was
(A) de Vries
(B) Mendel
(C) Darwin
(D) Morgan
21. A normal vision female whose father is colour-blind marries a normal vision male. What would be the probability of her sons and daughters to be colour blind?
(A) 25% sons colour blind and all daughters with phenotypically normal vision
(B) 50% sons colour blind and 50% daughter normal
(C) 50% sons colour blind and 50% daughter colour blind
(D) All sons normal and 50% colour blind daughter.
22. A child with blood group ‘O’ has ‘B’ blood group type father then the father has geno type of:
(A) 1°T°
(B) I°IB
(C) IBIB
(D) IAIA
23. Human blood group O has :
(A) antigen absent
(B) antibody absent
(C) antigen present
(D) antibody A present
24. Purine base on DNA molecule has :
(A) A and C
(B) C and T
(C) A and G
(D) none of these
25. How many nitrogen base pairs are present in a complete rotation (twist) of B-DNA:
(A) 5
(B) 10
(C) 15
(D) 20
26. Bacteria has :
(A) Plasmid DNA
(B) RNA
(C) Both ‘A’ and ‘B’
(D) None of these
27. Which one is phenotypic ratio of Monohybrid cross?
(A) 1:2:1
(B) 3:1
(C) 9:3:3:1
(D) None
28. Chromosome number in human being (male) is:
(A) 44 + XX
(B) 44 + xy
(C) 46 + xy
(D) 46 + XX
29. Mutations can be induced with
(A) Ethylene
(B) Gamma radiations
(C) Infra-red radiations
(D) IAA
30. Ultimate source of Variations is :
(A) Mitosis
(B) Meiosis
(C) Fertilization
(D) Mutations
31. The human chromosome with highest and least number of genes are :
(A) Chromosome 21 and Y
(B) Chromosome 1 and X
(C) Chromosome 1 and Y
(D) Chromosome X and Y
32. Sickle cell anaemia shows :
(A) Epistrasis
(B) Co-dominance
(C) Pleiotropy
(D) Incomplete dominance
33. Which of the following Blood Group is Universal donar ?
(A) A
(B) B
(C) AB
(D) O
34. 1:2:1 Ratio is a cross show :
(A) Dominance
(B) Incomplete Dominance
(C) Linkage
(D) None of these
35. Chromosome number in human female (Woman) is :
(A) 44 + XX
(B) 44 + XY
(C) 44 + YY
(D) None
36. Genotypic Ratio of Monohybrid cross is :
(A) 1:2:1
(B) 3:1
(C) 9:3:3:1
(D) None of these
37. Brewery is concerned with:
(A) Saccharomyces
(B) Protozoans
(C) Pteridophytes
(D) Marsupials