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 "

Try The Short Questions For 12th Class Biology Chapter 20 Short Questions Preparation

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Biology - 12th Class Biology Chapter 20 Short Questions Preparation

Question # 1

Define Mutation.

  • Ans 1: The sudden change in DNA or gene is called mutation.
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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

Define Mutation.

  • Ans 1: The sudden change in DNA or gene is called mutation.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 2

Question # 1

Define phenylketonuria. OR What is phenylketonuria?

  • Ans 1: In phenylketonuria,phenylalanine is not degraded because of defective enzyme phenylalanine hydroxylase. Phenylalanine consequently accumulates in the cells leading to mental retardation,as the brain cells fails to develop in infancy.This disorder is due to point mutation.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 3

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 Preparation - Set 4

Question # 1

What is point mutation? Give two examples.

  • Ans 1: Point mutation are mutational changes that affects the message itself,producing alterations in the sequence of DNA nucleotides. If alteration involves mutations.For example sickle cell anemia and phenylketonuria.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 5

Question # 1

What is gene?

  • Ans 1: The sequence of nucleotides that determines the amino acid sequence of a protein is called gene.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 6

Question # 1

Define initiation codon. What does it codes for?

  • Ans 1: Initiation codon is first codon in the process of protein synthesis from where protein synthesis starts.It codes for methionine.
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12th Class Biology Chapter 20 Short Questions

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