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

Give chromosomal theory of inheritance.

  • Ans 1: According to this theory,genes are located on chromosomes. At the time of cell division all the genes which are present on a chromosome,will go to same cell in which cell chromosome is transported.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 3

Question # 1

Enlist non sense codons and their function.

  • Ans 1: Non sense condons do not specifiy any amino acid. They are used to terminate or to stop the protein synthesis.Their names are UAA,UGA and UGA.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 4

Question # 1

Differentiate between template and coding stands of DNA.

  • Ans 1: Template Strand: The strand of DNA which is transcribed is called template strand or antisense strand.
  • Ans 2: Coding Strand: The Strand of DNA which is not transcribed is called coding strand or sense strand.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 5

Question # 1

What is transcription bubble? How is it formed?

  • Ans 1: The DNA strand open at specific place where enzyme is attached to the template strand forming transcription bubble.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 6

Question # 1

Differentiate between semi conservative replication and conservative replication.

  • Ans 1: Semi Conservative Replication: The two strands of double helix of DNA separate out acting as a model or template,along which new nucleotide are arranged thus giving rise to two new DNA duplexes.
  • Ans 2: Conservative Replication: This model states that the parental double helix would remain intact and generate DNA copies consisting of entirely new molecule.
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12th Class Biology Chapter 20 Short Questions

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