Polygenic And Chromosomal Theroy Of Inheritance Test

Polygenic And Chromosomal Theroy Of Inheritance

This is online test 01 for CBSE class 12 Biology Principles of Inheritance and Variation (Polygenic and chromosomal theroy of inheritance).. There are 10 questions in this test with each question having around four answer choices.

Questions & Answers

1
Chromosome theory of inheritance was proposed by
  • A
    George Hammer
  • B
    W.Sutton and T.Bover
    Correct
  • C
    Watson and Crick
  • D
    Mendel
2
In humans, height shows a lot of variation. It is an example of
  • A
    Pleiotrophic inheritance
  • B
    Multiple alleles
  • C
    Polygenic inheritance
    Correct
  • D
    False allelic inheritance
3
Which among the following occurs in pair?
  • A
    Only chromosome
  • B
    Only gene
  • C
    Neither gene nor chromosome
  • D
    Both gene and chromosome
    Correct
4
Chromosomal theory of inheritance was experimentally verified by T.H.Morgan and his colleagues working with tiny flies
  • A
    House fly
  • B
    Mirabilis Jalapa
  • C
    Spider
  • D
    Drosophila melanogaster
    Correct
5
Chromosome theory of XY sex determination was proposed by
  • A
    Johannsen
  • B
    Wilson and Stevens
    Correct
  • C
    Sutton and Boveri
  • D
    Henking
6
Crossing over occurs at
  • A
    Metaphase-II of meiosis
  • B
    Two-strand stage during zygotne
  • C
    Four strand stage of panchytene
    Correct
  • D
    Single-strand stage of chromosome during prophase
7
Inheritance of skin colour in humans is an example of
  • A
    Polygenic inheritance
    Correct
  • B
    Co-dominance
  • C
    Chromosomal aberrations
  • D
    Point Mutation
8
Crossing over brings
  • A
    Reduction in number of chromosome
  • B
    Recombination of genes
    Correct
  • C
    Segregation of genes
  • D
    New trait into species
9
The phenomenon of having more than two sets of chromosome is called
  • A
    Allopolyploidy
  • B
    Aneuploidy
  • C
    Polyploidy
    Correct
  • D
    Autopolypoidy
10
A polygenic trait is controlled by 3 genes A, B and C. In a cross AaBbCc × AaBbCc, the phenotypic ratio of the offspring was observed as 1 : 6 : x : 20 : x : 6 : 1. What is the possible value of x?
  • A
    12
  • B
    15
    Correct
  • C
    9
  • D
    25