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

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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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

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 2

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 3

Question # 1

Compare telocentric and acrocentric chromosomes.

  • Ans 1: Telocentric Chromosomes:Telocentric has centromere at one end and chromatid part is present at other end.
  • Ans 2: Acrocentric Chromosomes: Acrocentric has two unequal arms one is short and other is long.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 4

Question # 1

Differentiate between pyrimidines and purines.

  • Ans 1: Pyrimidines: Pyrimidines are nitrogenous bases present in nucleic acids,having only single ringed structure which is only six cornered.
    Examples: Cytosine,Thymine and uracil.
  • Ans 2: Purines: Purines are another type of nitrogenous bases present in nuclei acids having double ringed structure. One ring issoc cornered while second is of five cornered.
    Example: Adenine & Guanine.
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12th Class Biology Chapter 20 Short Questions Preparation - Set 5

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 6

Question # 1

Enlist initiation codon and non-sense codons.

  • Ans 1: Initiation codon is Aug and non sense condons are UAA,UAG and UGA.
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12th Class Biology Chapter 20 Short Questions

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