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

Differentiate between heterochromatin and euchromatin.

  • Ans 1: Heterochromatin:Highly condensed part of chromatin is called heterochromatin. This part remains permanently condensed and never be expressed.
  • Ans 2: Euchromatin:The part of chromatin other than heterochromatin is called euchromatin. It condenses only during cell division,when compact packaging facilitates the movement of chromosomes.
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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

Differentiate between heterochromatin and euchromatin.

  • Ans 1: Heterochromatin:Highly condensed part of chromatin is called heterochromatin. This part remains permanently condensed and never be expressed.
  • Ans 2: Euchromatin:The part of chromatin other than heterochromatin is called euchromatin. It condenses only during cell division,when compact packaging facilitates the movement of chromosomes.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 2

Question # 1

What is mutation? Give its name of two classes.

  • Ans 1: Changes in the DNA occur either due to mistake in replication or damage to the genetic message is known as mutations. its classes are:
    1- Point mutations 2- Chromosomal aberrations.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 3

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 4

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 5

Question # 1

Define genetic code.

  • Ans 1: Genetic code is combination of three nucleotides,which specify a particular amino acid.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 6

Question # 1

What are Okazaki fragments? Also give their length.

  • Ans 1: During replication of DNA,one of its strands is discontinuously synthesized in the form of fragments called Okazaki fragments.Its length in eukaryotes is 100 to 200 nucleotides while in prokaryotes it is 1000 to 2000 nucleotides.
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12th Class Biology Chapter 20 Short Questions

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