OpenStax
Open Stax: Nucleus and Dna Replication
This site explains the nucleus, the control center of a cell, and DNA replication.
CK-12 Foundation
Ck 12: Life Science: Mitosis and Cytokinesis
[Free Registration/Login may be required to access all resource tools.] During mitosis, the DNA in a nucleus must replicate. The copied DNA is divided into two genetically identical sets, so that after cytokinesis or cell division, each...