BSEB 12th Biology Most Important Objective MCQ Question Chapter Wise in English
5. PRINCIPLES OF INHERITANCE AND VARIATION
1. The term “Genetics’ was proposed by:
(A) Mendel
(B) Morgan
(C) Beteson
(D) Johansen
| Answer :- (C) |
2. What is the number of chromosomes in Down’s syndrome ?
(A) 46
(B) 47
(C) 48
(D) None of these
| Answer :- (B) |
3. Triticum aestivum is :
(A) Triploid
(B) Tetraploid
(C) Hexaploid
(D) Diploid
| Answer :- (C) |
4. Tumer’s syndrome will contain how many chromosomes ?
(A) 45
(B) 46
(C) 47
(D) None of these
| Answer :- (A) |
5. ‘ABO’ blood group in human beings shows :
(A) incomplete dominance
(B) multiple allele
(C) co-dominance
(D) both (B) and (C)
| Answer :- (D) |
6. 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
| Answer :- (C) |
7. The phenotypic ratio for F2 generation in Incomplete dominance is :
(A) 3:1
(B) 2 : 2
(C) 1:2:1
(D) None of these
| Answer :- (C) |
8. 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
| Answer :- (B) |
9. Mutations can be induced with
(A) Ethylene
(B) Gamma radiations
(C) Infra-red radiations
(D) IAA
| Answer :- (A) |
10. Ultimate source of Variations is :
(A) Mitosis
(B) Meiosis
(C) Fertilization
(D) Mutations
| Answer :- (D) |
11. What is considered as father of genetics ?
(A) Hugo de Vries
(B) Morgan
(C) Mendel
(D) Darwin
| Answer :- (C) |
12. 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
| Answer :- (B) |
13. Mendel proposed :
(A) law of linkage
(B) 10% energy law
(C) laws of inheritance
(D) none of these
| Answer :- (C) |
14. How many characters were studied by Mendel ?
(A) Five
(B) Four
(C) Seven
(D) Three
| Answer :- (C) |
15. Mendel selected :
(A) Gram
(B) Pinus
(C) Tomato
(D) Garden pea
| Answer :- (D) |
16. 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
| Answer :- (C) |
17. In human blood group AB :
(A) antibodies are present
(B) antibodies are absent
(C) antibody a is present
(D) antibody b is present
| Answer :- (B) |
18. Loss of Melanin pigment cause for :
(A) Colourblindness
(B) Depigmentation
(C) Phenyl Ketoneuria
(D) Alkaptoneuria
| Answer :- (B) |
19. Mendal was born in :
(A) 17th century
(B) 18th century
(C) 19th century
(D) 8th century
| Answer :- (C) |
20. First geneticist/father of genetics was
(A) de Vries
(B) Mendel
(C) Darwin
(D) Morgan
| Answer :- (B) |
21. An individual with two identical alleles is :
(A) Hybrid
(B) Dominant
(C) Homozygous
(D) Heterozygous
| Answer :- (C) |
22. ZZ ⁄ ZW type of sex determination is seen in :
(A) platypus
(B) snails
(C) cockroach
(D) peacock
| Answer :- (D) |
23. Human blood group O has :
(A) antigen absent
(B) antibody absent
(C) antigen present
(D) antibody A present
| Answer :- (A) |
24. Purine base on DNA molecule has :
(A) A and C
(B) C and T
(C) A and G
(D) none of these
| Answer :- (C) |
25. How many nitrogen base pairs are present in a complete rotation (twist) of B-DNA:
(A) 5
(B) 10
(C) 15
(D) 20
| Answer :- (B) |
26. Bacteria has :
(A) Plasmid DNA
(B) RNA
(C) Both ‘A’ and ‘B’
(D) None of these
| Answer :- (C) |
27. Which of the following Blood Group is Universal donar ?
(A) A
(B) B
(C) AB
(D) O
| Answer :- (D) |
28. 1:2:1 Ratio is a cross show :
(A) Dominance
(B) Incomplete Dominance
(C) Linkage
(D) None of these
| Answer :- (A) |
29. Which one is phenotypic ratio of Monohybrid cross?
(A) 1:2:1
(B) 3:1
(C) 9:3:3:1
(D) None
| Answer :- (B) |
30. Chromosome number in human being (male) is:
(A) 44 + XX
(B) 44 + xy
(C) 46 + xy
(D) 46 + XX
| Answer :- (B) |
31. Inheritance of acquired characters was given by :
(A) Drawin
(B) Lamarch
(C) Devries
(D) Haeckel
| Answer :- (B) |
32. Genes present on same locus having different expre-ssions are called :
(A) Multiple allele
(B) Polygene
(C) Oncogene
(D) Codominant gene
| Answer :- (A) |
33. 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
| Answer :- (A) |
34. Sickle cell anaemia shows :
(A) Epistrasis
(B) Co-dominance
(C) Pleiotropy
(D) Incomplete dominance
| Answer :- (C) |
35. 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.
| Answer :- (A) |
36. 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
| Answer :- (B) |
37. Chromosome number in human female (Woman) is :
(A) 44 + XX
(B) 44 + XY
(C) 44 + YY
(D) None
| Answer :- (A) |
38. Genotypic Ratio of Monohybrid cross is :
(A) 1:2:1
(B) 3:1
(C) 9:3:3:1
(D) None of these
| Answer :- (A) |
39. Brewery is concerned with:
(A) Saccharomyces
(B) Protozoans
(C) Pteridophytes
(D) Marsupials
| Answer :- (A) |
40. Sickel-cell anemia is related to which type of disease ?
(A) Sex linked disease
(B) Autosomal linked disease
(C) Deficiency disease
(D) Metabolic disease
| Answer :- (B) |
41. Lac operon represent
(A) Inducible gene system
(B) Represssible gene system
(C) Housekeeping gene system
(D) All of these
| Answer :- (B) |
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