NCERT Solutions For Class 12 Biology Chapter 6: Molecular Basis of Inheritance

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NCERT Solutions for Class 12 Biology Chapter 6 Molecular Basis of Inheritance are provided in this article. It includes all the important definitions, concepts, and methodologies that will be really beneficial for the students appearing for CBSE Class 12 Exam 2022-23. The important topics that are included in this chapter are:

Expected no. of Questions: 1-2 questions of around 4 marks.

NCERT Solutions for Class 12 Biology Chapter 6

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Class 12 Biology Chapter 6 Molecular Basis of Inheritance: Important Topics

The two types of nucleic acids present in living systems are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA behaves similarly to genetic material in most organisms. Although RNA serves as genetic material in some viruses, it is mostly used as a messenger. RNA also serves other functions. It serves as an adaptor, structural molecule, and in certain situations a catalytic molecule. The structure of DNA, its replication, the method of creating RNA from DNA (transcription), the genetic code that specifies the sequences of amino acids in proteins, the process of protein synthesis (translation), and the fundamental foundation of their control are all covered in this chapter.

  • Structure of DNA

DNA is composed of two linked strands that wind around each other to resemble a twisted ladder, namely a shape known as a double helix. Each strand possesses a backbone made of alternating sugar (deoxyribose) and phosphate groups. Attached to each sugar is one of four bases: adenine (A), cytosine (C), guanine (G) or thymine (T).

  • Structure of RNA

Ribonucleic acid (RNA) is a molecule that is made up of nucleotides, which are ribose sugars attached to nitrogenous bases and phosphate groups. It is present in the majority of living organisms and viruses. The nitrogenous bases include adenine, guanine, uracil, and cytosine.

  • Genome and Genomics

A genome is an organism's complete set of DNA that includes all of its genes as well as its hierarchical, three-dimensional structural configuration. Genomics is referred to an interdisciplinary field of biology focusing on the structure, function, evolution, mapping, and editing of genomes.


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CBSE CLASS XII Related Questions

  • 1.
    Assertion (A) : The milk produced by transgenic cow 'Rosie' was nutritionally more balanced product for human babies than natural cow milk.
    Reason (R) : It was human protein enriched milk containing human alpha lactaglobulin.

      • Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
      • Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
      • Assertion (A) is true, but Reason (R) is false.
      • Assertion (A) is false, but Reason (R) is true.

    • 2.
      Monascus purpureus is a yeast used commercially in the production of which one of the following?

        • Ethanol
        • Streptokinase
        • Citric acid
        • Statins

      • 3.
        Assertion (A): The embryo with 8 to 16 blastomeres is called a morula.
        Reason (R): The morula continues to divide and transform into trophoblast.

          • Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
          • Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
          • Assertion (A) is true, but Reason (R) is false.
          • Assertion (A) is false, but Reason (R) is true.

        • 4.

          Assertion (A) : The pyramid of biomass in a pond aquatic ecosystem is always inverted.

          Reason (R) : The biomass of consumers like fishes far exceeds that of the producers like phytoplanktons.

            • Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
            • Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
            • Assertion (A) is true, but Reason (R) is false.
            • Assertion (A) is false, but Reason (R) is true.

          • 5.
            In Pisum sativum, the flower colour may be violet (V) or white (v). What proportion of the offspring in a cross of "VV × vv" would be expected to be violet?

              • 25%
              • 50%
              • 75%
              • 100%

            • 6.

              (i) Differentiate between a DNA and RNA nucleotide.

              (ii) Name the two types of bonds present within a single nucleotide.

                CBSE CLASS XII Previous Year Papers

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