12 Class Fsc Part 2 Short Questions Online Preparation of biology chapter 20 (Chromosoms and DNA)

Online Short Questions For Chapter 6 "12th Class Biology Chapter 20 Short Questions Preparation "

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Biology - 12th Class Biology Chapter 20 Short Questions Preparation

Question # 1

What are mutagens? Give one example.

  • Ans 1: In genetics,a mutagen is a physical or chemical agent that changes the genetic material,usually DNA of an organism and thus increases the frequency of mutations.
    For Example: X-ray,ultraviolet radiations etc.
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Prepare Complete Set Wise Questions For Chapter 6 "12th Class Biology Chapter 20 Short Questions Preparation "

12th Class Biology Chapter 20 Short Questions Preparation - Set 1

Question # 1

What are mutagens? Give one example.

  • Ans 1: In genetics,a mutagen is a physical or chemical agent that changes the genetic material,usually DNA of an organism and thus increases the frequency of mutations.
    For Example: X-ray,ultraviolet radiations etc.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 2

Question # 1

What is Semi-Conservative Model of DNA Replication?

  • Ans 1: In semi conservative replication,the two strands of the duplex separates out each acting as a model or mold,along which new nucleotides are arranged thus giving rise to two new duplexes.In this process,by separation of two strands,primary structure has been conserved, whereas the secondary structure has been disrupted.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 3

Question # 1

Mention the types of chromosomes due to centromeric position.

  • Ans 1: There are four types of chromosomes.
    i) Metacentric ii)Sub Metacentric iii)Acrocentric iv)Sub Acrocentric.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 4

Question # 1

Describe chromosomal aberrations.

  • Ans 1: Chromosomal aberrations are mega changes which involve presence of an extra chromosome or loss of a chromosome from the diploid number of chromosomes or changes like addition,insertion,inversion and duplication.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 5

Question # 1

Define Euchromatin.

  • Ans 1: The part of DNA is expressed time to time and condensed only during the cell division is called euchromatin. This coiling helps in movement of chromosomes during cell division.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 6

Question # 1

What is nucleosome? Or Define nucleosome.

  • Ans 1: The DNA duplex is coiled around eight histone proteins forming a complex known as a nucleosome. It appears like beads on a string.
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12th Class Biology Chapter 20 Short Questions

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