How do you describe how DNA copies itself?

Answer 1

DNA replication occurrs through a process called mitosis. The stages of mitosis are (I)PMAT.

1. Interphase

In the G1 phase, protein synthesis occurrs and mRNA runs along the chromosomes. In the S phase, DNA polymerase runs along the chromosomes/chromatids and creates complementary strands of DNA. In the G2 phase, the 23 chromosomes all have sister chromatids.

2. Prophase- Chromosomes condense, spindle fibers form, and the nuclear membrane disintegrates. (23 chromosomes/46 chromatids)

3. Metaphase- the chromosomes line up in the middle of the cell and spindle fibers from the centrioles connect to the chromosomes at the kinetochores. (23 chromosomes/46 chromatids)

4. Anaphase- Sister chromatids are pulled apart by the spindle fibers to each pole of the cell. (23 chromosomes/46 chromatids)

5. Telophase- nuclear envolopes form around the chromatids at each pole, the spindle fibers reduce, the chromatids decondense. (46 chromosomes/ 46 chromatids)

Then cytokinesis occurrs to split up the cell into two cells.