Heridity And Variation Test

Heridity And Variation

This is online test 04 for CBSE class 12 Biology Principles of Inheritance and Variation (Heridity and variation).. There are 10 questions in this test with each question having around four answer choices.

Questions & Answers

1
All of the below obeys Mendel’s law except
  • A
    Independent assortment
  • B
    Linkage
    Correct
  • C
    Purity of gametes
  • D
    Dominance
2
The major reason for the success of Mendelian experiments was
  • A
    Garden pea was true breeding
    Correct
  • B
    Garden pea was cross breeding
  • C
    Garden pea was heterozygous
  • D
    Garden pea was easily available
3
Which of the following statements is true regarding the “law of independent assortment”?
  • A
    Independent assortment leads to variation
  • B
    Factors assort independent of each other when more than one pair of characters are present together
    Correct
  • C
    All of these
  • D
    Independent assortment leads to formation of new combinations of characters
4
Two pea plants were subjected cross pollination. Of the 183 plants produced in the next generation, 94 plants were found to be tall and 89 plants were found to be dwarf. The genotypes of the two parental plants are likely to be
  • A
    Tt and tt
    Correct
  • B
    Tt and tt
  • C
    TT and TT
  • D
    Tt and Tt
5
In Mendel's experiments with garden pea, round seed shape (RR) was dominant over Wrinkled Seeds (rr), Yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected Phenotypes in the F2 generation of the cross RRYY x rryy?
  • A
    Only wrinkled seeds with yellow cotyledons
  • B
    Only round seeds with green cotyledons
  • C
    Only wrinkled seeds with green cotyledons
  • D
    Round -yellow; wrinkled -yellow; round-green and wrinkled- green
    Correct
6
In a dihybrid cross between AABB and aabb the ratio of AABB, AABb, aaBb, aabb in F2 generation is
  • A
    1 : 1 : 2
  • B
    1: 2: 2: 1
    Correct
  • C
    1: 1: 1: 1
  • D
    9 : 3 : 3: 1
7
In a plant, gene "T" is responsible for tallness and its recessive allele "t" for dwarfness and "R" is responsible for red colour flower and its recessive allele "r" of white flower colour. A tall and red flowered plant with genotype TtRr crossed with dwarf and red flowered ttRr. What is the percentage of dwarf - white flowered offspring of above cross?
  • A
    12.5 %
    Correct
  • B
    60 %
  • C
    50 %
  • D
    6.25 %
8
In order to find out the different types of offsprings produced by a pea plant having the genotype AaBb it should be crossed to a plant with the genotype
  • A
    AaBb
    Correct
  • B
    aaBB
  • C
    AaBb
  • D
    AaBB
9
How many different kinds of gametes will be produced by a plant having the genotype AABbCC?
  • A
    3
  • B
    2
    Correct
  • C
    9
  • D
    4
10
Which one of the following cannot be explained on the basis of Mendel's law of inheritance?
  • A
    Alleles do not show any blending and both the characters recover as such in F2generation
    Correct
  • B
    Out of one pair of factors one is dominant, and the other recessive
  • C
    The discrete unit controlling a particular character is called a factor
  • D
    Factors occur in pairs