During the cell cycle, DNA replication occurs during the S-phase portion of the interphase. Interphase occurs between cell divisions and is a necessary precursor step for cell division.Continue Reading
Interphase is divided into three successive stages: the G1 phase, S phase and G2 phase. The flanking G phases involve cell growth and preparation for division of the cell to occur; the "G" in G phase stands for growth. In between these growth periods, the cell undergoes the synthesis, or S, phase. During the S phase, the chromosomes within the cell are copied so that the divided cells have matching copies of DNA. The cell then undergoes the more visibly active stages of cell division: prophase, anaphase, telophase and cytokinesis.
Typical human cells take around 24 hours to complete a full cycle of cell replication and division. The longest portion of this process is interphase, which takes around 23 hours. The replication of chromosomes during the S phase takes about 8 hours. Other types of cells complete cell division more rapidly; for example, during early embryonic development, the complete cell cycle can occur in about 30 minutes. In these rapid cell divisions, the growth phases are often skipped or drastically reduced and replication takes place more quickly. Even when the G1 and G2 phases don't occur, the cell must complete the S phase of interphase in order to replicate its DNA before division.Learn more about Molecular Biology & DNA
DNA replication is a method of making many copies of DNA. The process starts at defined DNA sites. Researchers at the U.S. Department of Energy's Brookhaven National Laboratory and Cold Spring Harbor Laboratory studied all of the steps in the process of DNA replication.Full Answer >
DNA replicates so that new cells can be created; the replication allows old or damaged cells to create replacement cells that support the life of the organism. DNA replication permits the new cells to have the same genetic material as the parent cells. This genetic material informs the cells of their role in helping the organism live.Full Answer >
DNA copies itself through the process of DNA replication. This process occurs before a cell can divide, so that the new cell obtains a fully functional strand of DNA. In eukaryotes, DNA replication occurs during the S phase of the cell cycle.Full Answer >
DNA replication is known as semiconservative replication because half of the original DNA strand is conserved throughout the replication process. A new strand of DNA forms by using half of the original strand as a template.Full Answer >