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Draw a labelled diagram of a 'replicatin...

Draw a labelled diagram of a 'replicating fork' showing the polarity. Why does DNA replication occur within such 'forks'?

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The replication does not initiate randomly at any place in DNA. Replication originates at definite region of DNA called origin of replication which lies in replication fork. At replication fork, replication is continuous in template with polarity 3. `to`5. (leading strand) while in the other template with polarity 5. `to`3. (lagging strand), replication is discontinuous due to exposure of small stretches of template at one time
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