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

Jasmine Grover logo

Jasmine Grover

Education Journalist | Study Abroad Lead

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

NCERT Solutions Physics NCERT Solutions Physics NCERT Solutions Physics NCERT Solutions Physics NCERT Solutions Physics NCERT Solutions Physics NCERT Solutions Physics NCERT Solutions Physics NCERT Solutions Physics NCERT Solutions Physics NCERT Solutions Physics NCERT Solutions Physics

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.


Also Read:

Check-Out: 

CBSE CLASS XII Related Questions

  • 1.
    Describe the series of experiments conducted by Frederick Griffith. Comment on the significance of the result obtained.
    State the contribution of Avery, MacLeod and McCarty.


      • 2.
        What is meant by translation in protein synthesis?
        Explain charging of tRNA (aminoacylation of tRNA) and mention its importance in the process of translation.


          • 3.
            Work out the crosses between:
            Normal female and Haemophilic male
            Carrier female and Normal male
            (III) Carrier female and Haemophilic male
            Write the conclusions you draw from these crosses. Comment on the type of inheritance of the disease.
            (Use: $X$ - Normal, $X^h$ - Haemophilic)


              • 4.

                Read the following passage and answer the questions that follow: 
                The data below shows the concentration of nicotine smoked by a smoker taking 10puffs/minute.
                 


                  • 5.
                    Read the following passage and answer the questions that follow:
                    India is one of the megadiverse countries housing around 8·1 per cent of global species diversity, although its land area is only 2·4 per cent of the world’s land area. Many of the species are highly threatened due to human activities like deforestation, mining and habitat fragmentation. Laws like Wildlife (Protection) Act, 1972 were enacted by the Government of India to preserve our biological wealth. Various conservation measures are being implemented to save the threatened species. The following bar graph shows the number of species conserved under different biodiversity conservation methods.

                    Which other methods shown in the diagram are opposite to the one identified by you in question ? How are these two conservation approaches different?
                    (c) Write two features of Biodiversity hotspots.
                    (c) To which category do sacred groves belong and how do they help in bio-conservation?


                      • 6.
                        In vitro fertilization (IVF) is a popular method these days that is helping childless couples to bear a child.
                        Write the different steps that are carried out in this technique.
                        Would you consider gamete intra fallopian transfer as a type of IVF? Justify your answer.

                          CBSE CLASS XII Previous Year Papers

                          Comments


                          No Comments To Show