Quiz  /  Chromosomes Class 10 MCQ Questions With Answers

  • 1. 
    What does DNA stand for?

  • Deoxyribosenucleic acid
  • Deribosenucleic acid
  • Deoxyribose
  • Nucleic acid

  • 2. 
    Sister chromatids are held together by a

  • histone core
  • chromatin
  • nucleosome
  • centromere

  • 3. 
    Chromosomes play an important role in:

  • growth
  • reproduction
  • repair
  • All Of above

  • 4. 
    Chromosomes carries genetic material from one generation to another. Hence called the '............................'.

  • Vehicle of Genetics
  • Vehicle of Cell
  • Vehicle of Heredity
  • Vehicle of Life

  • 5. 
    An organism’s physical appearance is its

  • dominance
  • genotype
  • phenotype
  • allele

  • 6. 
    The term “chromosomes” literally means

  • Inherited bodies
  • Twisted threads
  • Coloured bodies
  • Shining threads

  • 7. 
    A chromosome is composed of two identical sister

  • centromeres
  • chromatids
  • autosomes
  • somatic cells

  • 8. 
    What does the notation Tt mean to geneticists?

  • two dominant alleles
  • one dominant and one recessive allele
  • homozygous alleles
  • two recessive alleles

  • 9. 
    The diploid number of human chromosomes is

  • 23
  • 46
  • 92

  • 10. 
    Which of the following statements about homologous chromosomes is correct?

  • Each gene is at the same locus on both chromosomes.
  • They are two identical copies of a parent chromosome which are attached to one another at the centromere.
  • They come from the same parent.
  • They are chromosomes that have identical genes and alleles.

  • 11. 
    Made of chromatin and become visible during cell division

  • chromosomes
  • histones
  • mitochondria
  • nucleosomes

  • 12. 
    The position of a gene on a chromosomes is the _______.

  • allele
  • gene locus

  • 13. 
    How many DNA molecules make up a chromosome?

  • 1
  • 2
  • 23
  • 46

  • 14. 
    Chromosomes in animals were first studied by a German Scientist, named ................................

  • Walther Flemming
  • Robert Hooke
  • Friedrich Miescher
  • Antonie van Leeuwenhoek

  • 15. 
    Which of the following statements about chromosomes is correct?

  • Chromosomes are long, thread-like structures
  • Chromosomes are found in the nucleus of all cells in the human body
  • Chromosomes contain DNA
  • All of the above

  • 16. 
    If a homozygous black guinea pig (BB) is crossed with a homozygous white guinea pig (bb), what is the probability that an offspring will have black fur?

  • 25%
  • 50%
  • 75%
  • 100%

  • 17. 
    An organism that has two identical alleles for a trait is

  • homozygous
  • heterozygous
  • a phenotype
  • tall

  • 18. 
    A picture or image of a person's chromosomes taken through a microscope

  • pedigree
  • centromere
  • karyotype
  • none are correct

  • 19. 
    Which of the following base pairings is correct?

  • T-T, C-A
  • A-T, C-C
  • A-T, C-G
  • C-G, C-C

  • 20. 
    Chromosomes that do not determine the sex of an individual

  • autosomes
  • sex chromosomes
  • gametes
  • chromatids

  • 21. 
    The long chain of DNA molecule forms the functional units called

  • mitochondria
  • gene
  • centromere
  • base pair

  • 22. 
    The substance that chromosomes are composed of is called

  • nucleosomes
  • DNA
  • chromatin
  • histones

  • 23. 
    A _______ is an egg that has been fertilized by a sperm cell.

  • gene
  • chromosome
  • zygote
  • embryo

  • 24. 
    A nondisjunction resulting in three chromosomes in one position is called

  • monosomy
  • disomy
  • trisomy
  • polysomy

  • 25. 
    The gametes only contain half as many chromosomes as your body cells.

  • True
  • False

  • 26. 
    Of the chromosomes in your cells, how many are sex chromosomes?

  • 1
  • 2
  • 3
  • 4

  • 27. 
    If a gene is found only on the X chromosome and not the Y chromosome, it is said to be what?

  • sex-linked trait
  • polygenic trait
  • codominant trait
  • incomplete dominance trait
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