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B1(b). In the diagram below, a short segment of DNA is replicated in the presence of radioactive nucleotides. Explain briefly

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DNA replication is a semi- conservative process which means that the new synthesised DNA consists of a strand from the parent and a complementary new strand.

So the DNA template opens up through origin of replication to form a fork like structure and then the DNA polymerase attaches new dNTPs to both the strands.

K daughter molecule old strand new strand Joox daughter molecule​​​​​​

For the given double stranded DNA radioactive nucleotide are used for the in vitro replication which will lead to the formation of radioactive daughter strands. Therefore, in the given question the radioactive DNA strands are:

II and III

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