# NCERT Solutions Class 12 Biology Chapter 6 Molecular Basis of Inheritance

NCERT Solutions Class 12 Biology Chapter 6 Molecular Basis of Inheritance. The NCERT solutions for Class 11 Mathematics have been made by Mathematics teacher of one of the best CBSE school in India. These NCERT solutions have been made to give detailed answers and expanations of the concepts as per NCERT which can be easily understood by the students. Refer to other links also to download mathematics NCERT solutions, worksheets, sample papers and Exemplar Solutions.

Class 12 Biology

NCERT Solutions

Chapter 6 Molecular Basis of Inheritance

1.Group the following as nitrogenous bases and nucleosides: Adenine, Cytidine, Thymine,Guanosine, Uracil and Cytosine.

Ans. Nitrogenous Bases – Adenine, Uracil and Cytosine, Thymine; Nucleosides – Cytidine, guanosine.

2.If a double stranded DNA has 20 per cent of cytosine, calculate the per cent of adenine in the DNA.

Ans. In a DNA molecule, the number of cytosine molecule is equal to guanine molecules & the number of adenine molecules are equal to thymine molecules. As a result, if a double stranded DNA has 20% of cytosine, it has 20% of guanine. The remaining 60% includes both adenine & thymine which are in equal amounts. So, the percentage of adenine is 30%.

3. If the sequence of one strand of DNA is written as follows:

5′-ATGCATGCATGCATGCATGCA

TGCATGC-3′

Write down the sequence of complementary strand in 5′ -> 3′ direction.

Ans. 5′-GCATGCATGCATGCATGCAT G C ATG CAT-3′.

4.If the sequence of the coding strand in a transcription unit is written as follows: 5-

ATGCATGCATGCATGCATGCA TGCATGC-3′ Write down the sequence of mRNA.

Ans. mRNA: 5′ -A U G CAU G CAU G C AU G CA UGCAUGCAUGC-3′.

5.Which property of DNA double helix led Watson and Crick to hypothesise semi-conservative mode of DNA replication? Explain.

Ans. Complementary base pairing property of DNA double helix led Watson and Crick to hypothesise semi-conservative mode of DNA replication. Watson & Crick observed that the nitrogenous bases are in complementary pairing in two strands of double helix of DNA molecule. Such an arrangement of DNA molecule led them to hypothesize the semi conservative mode of replication of DNA.

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