Table of Contents
- 1 Why is it important for a chromosome to be copied before mitosis?
- 2 Why do chromosomes replicate?
- 3 When are chromosomes duplicated — before or during mitosis?
- 4 What happens if a cell does not copy its chromosomes?
- 5 Where does DNA replication take place in the cell?
- 6 Why does a cell need a complete set of DNA?
Why is it important for a chromosome to be copied before mitosis?
DNA replication is an essential part of both mitosis and meiosis. It ensures that each daughter cell has the correct number of chromosomes. To replicate the DNA in mitosis, each chromosome replicates so that the new chromosome is attached to the original one at the centromere.
Why do chromosomes replicate?
Chromatid During cell division, the chromosomes first replicate so that each daughter cell receives a complete set of chromosomes. Following DNA replication, the chromosome consists of two identical structures called sister chromatids, which are joined at the centromere.
Why is it necessary for the cell to grow and duplicate its DNA before meiosis?
DNA replicates before a cell divides to give a complete set of genetic instructions to each daughter cell. If a cell begins meiosis without duplicating its DNA, the two resulting cells would have insufficient DNA to develop properly, as there would only be one copy of each chromosome in the parent cell.
When are chromosomes duplicated — before or during mitosis?
The chromosome number is the same in the daughter cells as it was in the parent cell. Because DNA is duplicated during interphase before the cell undergoes mitosis, the amount of DNA in the original parent cell and the daughter cells are exactly the same.
What happens if a cell does not copy its chromosomes?
If the cell has not properly copied its chromosomes, an enzyme called cyclin dependent kinase, or CDK, will not activate the cyclin, and the cell cycle will not proceed to the next phase. The cell will undergo cell death.
Why is it necessary for DNA to replicate before mitosis?
Explanation: DNA replication needs to occur because existing cells divide to produce new cells. Each cell needs a full instruction manual to operate properly. So the DNA needs to be copied before cell division so that each new cell receives a full set of instructions! Click to read full answer.
Where does DNA replication take place in the cell?
Mitosis is the process of nuclear division of cells and is part of the cell cycle. As you can see in the image below, DNA replication takes place in the S-phase of the cell cycle, which is before the cell enters mitosis. How many times does DNA replicate in meiosis?
Why does a cell need a complete set of DNA?
During mitosis, a cell divides into two identical cells referred to as daughter cells. In order for both cells to be fully functional and to be able to mature, they each need a complete set of DNA. To prevent the mutations and errors in the DNA, the process has to be extremely accurate.