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Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Steps of DNA Replication 1.separation of the DNA strands by helicase.

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Presentation on theme: "Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Steps of DNA Replication 1.separation of the DNA strands by helicase."— Presentation transcript:

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2 Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Steps of DNA Replication 1.separation of the DNA strands by helicase Hydrogen bonds between the bases are broken 2.DNA polymerases form new strands by adding complementary nucleotides to each of the original strands Each new DNA molecule is made of one strand of nucleotides from the original DNA molecule and one new strand. This is called semi- conservative replication. Ch 8-3

3 Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu DNA Replication

4 Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Replication Forks Increase the Speed of Replication

5 Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Errors in Replication Changes in DNA are called mutations DNA proofreading and repair prevent many replication errors Unrepaired mutations that affect genes that control cell division can cause diseases such as cancer

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