Class 12 · Molecular Basis of Inheritance

DNA Base Pairing & Replication — NEET Biology

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The base pairing confers a very unique property to the polynucleotide chains. They are said to be complementary to each other, and therefore if the sequence of bases in one strand is known then the sequence in other strand can be predicted. Also, if each strand from a DNA (let us call it as a parental DNA) acts as a template for synthesis of a new strand, the two double stranded DNA (let us call them as daughter DNA) thus, produced would be identical to the parental DNA molecule. Because of this, the genetic implications of the structure of DNA became very clear.

NCERT Biology · Class 12 · Chapter 5 · Paragraph 9
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Assertion (A): The sequence of one DNA strand can be predicted if the other strand’s sequence is known. Reason (R): Base pairing confers complementarity between the two polynucleotide chains.

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