Chromosome And Gene Test

Chromosome And Gene

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

Questions & Answers

1
The pairs of chromosomes present in human beings somatic cells are
  • A
    45
  • B
    23
    Correct
  • C
    22
  • D
    46
2
Genes are
  • A
    Segment of nucleus
  • B
    Segments of mitochondria
  • C
    Segment of chromosome
  • D
    Segment of DNA
    Correct
3
A somatic cell in human male contains
  • A
    No gene in sex chromosome
  • B
    Two genes for every sex linked character
  • C
    Genes only on sex chromosomes
  • D
    Only one sex-linked gene for each character
    Correct
4
The stage for counting of chromosome is
  • A
    Mid prophase
  • B
    Late prophase
  • C
    Metaphase
    Correct
  • D
    Early prophase
5
When chromosome sets are present in multiple of ‘n’ the condition is called
  • A
    Euploidy
    Correct
  • B
    Aneuploidy
  • C
    Diploidy
  • D
    Haploidy
6
Whose karyotype is represented below?
Question 6 figure 1
  • A
    Intersex Fly
  • B
    Male Drosophila
    Correct
  • C
    Super female fly
  • D
    Female Drosophila
7
The phenomenon of exchange of segments of chromosome between paternal and maternal chromosome is called
  • A
    Segregation
  • B
    Linkage
  • C
    Recombination
  • D
    Crossing over
    Correct
8
In somatic cells of human beings chromosomes exists as
  • A
    Haploid
  • B
    Heterologous pairs
  • C
    Single circular chromosome
  • D
    Homologous pairs
    Correct
9
Haploid chromosome number is 12. What is the number in monosomic?
  • A
    26
  • B
    23
    Correct
  • C
    25
  • D
    22
10
In human males, some recessive genes express their effect because
  • A
    Only two sex chromosome
  • B
    Only one Y-chromosome
  • C
    Only one X-chromosome
    Correct
  • D
    Single genome