Question Bank No: 2

1. Sex linked characters are generally

 a)Lethal
 b)recessive
 c)dominant
 d)not inherited

2. In a dihybrid cross, two recessive genes showed 10% recombinants. The distance between two genes is

 a)10 map units
 b)20 map units
 c)30 map units
 d)40 map units

3. Diploid chromosome number in humans is

 a)46
 b)44
 c)48
 d)42

4. Sex of a child is due to

 a)size of ovum
 b)Health of father
 c)Sex chromosome of father/sperm
 d)Sex chromosome of mother/ovum

5. In human beings 45 chromosomes/single X/XO abnormality causes

 a)Down's syndrome
 b)Klinefelter's syndrome
 c)Turner's syndrome
 d)Edward's syndrome

6. Nucleosome core is made of

 a)H1,H2A, H2B and H3
 b)H1,H2A, H2B, H3 and H4
 c)H1, H2A, H2B, H4
 d)H2A, H2B, H3 and H4

7. Turner's syndrome is characterised by chromosomes

 a)46
 b)45
 c)47
 d)48

8. Persons with Klinefelter's syndrome have chromosomes

 a)XX
 b)XY
 c)XXY
 d)XYY

9. Huntington's chorea appears at the age of

 a)25-55 years
 b)15-25 years
 c)50-60 years
 d)10-15 years

10. Crossing over in diploid organisms is responsible for

 a)Dominance of genes
 b)Linkage between genes
 c)Recombination of linked genes
 d)segregation of alleles

11. If Mendel had studied 7 traits using a plant with 12 chromosomes instead of 14, he would have

 a)discovered incomplete dominance
 b)not discovered the law of independent assortment
 c)discovered sex linkage
 d)mapped the chromosome

12. Mendel found certain traits not ti assort independently. It is due to

 a)dominance
 b)linkage
 c)crossing over
 d)amitosis

13. Which amino acid is substituted in sickle cell anaemia

 a)Glutamic acid by valine in α−chain
 b)Glutamic acid by valine in β−chain
 c)Valine by glutamic acid in β−chain
 d)Valine by glutamic acid in α−chain

14. Epistasis in which dihybrid ratio of 9:3:3:1 between Aa Bb ×AaBbis modified is

 a)dominance of one allele on another allele at the same locus
 b)dominance of one allele on another allele at both its loci
 c)interaction of two alleles at different loci
 d)interaction between two alleles at same locus

15. A blue fowl obtained from mating between black and white fowls, is self-crossed. The F2 ratio is

 a)1 black:2 white: 1 blue
 b)2 black: 1 white: 1 blue
 c)1 black: 2 blue :1white
 d)none of these

16. In Red-white flowered cross of Mirabilis jalapa, F2 generation has red, pink and white flowered plants in the ration of

 a)1:2:1
 b)1:0:1
 c)2:1:1
 d)1:1:2

17. A cross between homozygous recessive and heterozygous plant is

 a)Monohybrid cross
 b)Dihybrid cross
 c)Test cross
 d)Back cross

18. The superiority exhibited by the progeny over its parents is

 a)Heterosis
 b)Inbreeding depression
 c)Emaschlation
 d)Mutation

19. Marriage between a white and a Negro produce.

 a)Mullato
 b)Negro
 c)Caucasian
 d)Red Indian

20. Which of the following is pure for a trait

 a)Gamets
 b)Zygote
 c)Chromosome
 d)Root

21. How many different kinds of gametes may be produced by an organism with the genotype RrYy

 a)One
 b)Two
 c)Three
 d)Four

22. A true breeding tall pea plant crossed with atrue breeding dwarf pea plant gave F1 progeny which was all. F1 plants on selfing resulting in 787 tall and 277 dwarf plants in F2. The F1plants are

 a)Heterozygous
 b)Homozygous
 c)Hemizygous
 d)Dizygous

23. Mendelian re-combinations are due to

 a)Independent assortment
 b)Linkage
 c)Mutation
 d)Dominance

24. An example for Co- dominance is

 a)Sickle celled anaemiac gene
 b)Complementary gene
 c)Pleotropic gene
 d)Slain colour gene

25. Which of the following is quantitative inheritance

 a)Kernal colour of wheat
 b)Flower colour in Snapdragon
 c)Fruit shape in Pea
 d)Fruit shape in Mirabilis

26. F2 phenotypic ratio of dihybrid cross is

 a)3 : 1
 b)1: 2: 1
 c)9 : 3: 3: 1
 d)1 : 1

27. Mendel published the result of his experiment in the year

 a)1856
 b)1868
 c)1866
 d)1900

28. A Pleotropic gene control

 a)One phenotype
 b)Two phenotype
 c)Multiple Phenotype
 d)Dominance

29. The inheritance of skin colour in man is discovered by

 a)NIlson Ehle
 b)C. B. Davenport
 c)Carl Correns
 d)Hugo De Vries

30. An example for ibhibitory gene interaction is

 a)Feather colour in Fowls
 b)Fruit shape in shepherd's purse
 c)Flower colour in summer squash
 d)Coat colour in mice

31. The ratio 9:3:4 indicated

 a)Dominant epistasis
 b)Recessive epistasis
 c)Complementaory gene interaction
 d)Inhibitory gene

32. In Antirrhibnum major if red flowered plant is crossed with white flowered one what would be the flower colour in Fi

 a)Red
 b)Pink
 c)White
 d)Green

33. The experimental material selected by Gregor Mendel was.

 a)Pisum sativum
 b)Lathyrus Odoratus
 c)Phaseolus mungo
 d)Phaseolus radiatus

34. The most important reasons for Mendel's success was

 a)His wise choice of the experimental material
 b)Study of one or two characters at a time
 c)Systematical and statistical study
 d)All of these

35. Hugo De Vries, Erich Tschermak, Carl Correns were responsible for

 a)Chromosomes theory of inheritance
 b)Mutation theory
 c)Genic theory
 d)Ridiscovers of medalism

36. The expression of intermediate phenotype between dominant and recessive parent in mirabilis jalapa is due to.

 a)Complete dominance
 b)Incomplete, dominance
 c)Segregation
 d)Independent assortment

37. The removal of anther from a bisexual flower to prevent self pollination is

 a)Bagging
 b)Emasculation
 c)Castration
 d)Back cross

38. Genotype of an organism that is heterozygous for two genes would be.

 a)Aa Bb
 b)AABb
 c)AaBB
 d)aaBB

39. If a heteroxygous tall plant is crossed with a homozygous dwarf plant, the propotion of dwarf progeny will be

 a)25%
 b)100%
 c)75%
 d)50%

40. The cross of F1 hybrid with its recessive parent is

 a)Back cross
 b)Test cross
 c)Reciprocal cross
 d)Self cross

41. Dihybrid test cross ratio is

 a)1 : 2: 1
 b)1 : 1
 c)1 : 1 : 1 : 1
 d)9 : 3: 3:1

42. The character not studied by Mendel was

 a)Colour of seed
 b)shape of leaves
 c)Colour of flower
 d)Position of flower

43. The hypothesis of Pangenesis is suggested by

 a)Darwin
 b)Lamark
 c)Weismann
 d)T. H. Morgan

44. The gemotype of Fi heterozygous tall plant is

 a)TT
 b)Tt
 c)tt
 d)T

45. Law of Independent assortment can be explained with the help of

 a)Law of dominance
 b)Law of segregation
 c)Law of purity of gametes
 d)Dihyprid cross assortment

46. Which of the following term represents a pair of contrasting characters.

 a)Allels
 b)Homozygous
 c) Heteroxygous
 d)Phenotype

47. How many pairs of contrasting characters in pea pod were chosen by Mendel?

 a)2
 b)3
 c)4
 d)7