Question about Mitosis?

[ChemSiddiqui]

Hi, can anyone answer this 1 please.

 

" DNA replication occurs in cells during interphase before they divide by mitosis.

 

Explain why it is important that replication occurs before mitosis"

 

any help will be most appreciated.

 

Thnx

[SkepticLance]

Replication and mitosis are different processes. Replication involves a molecule (DNA), while mitosis involves whole chromosomes.

 

The chromosome is a complex with both DNA molecules and protein molecules together. The key part, of course, is the DNA. It's a bit like photos in a photo album. You have paper, glue and photo. The key part is the photo. The paper and glue are just a means of holding it all together.

 

To divide a chromosome, you begin with the key part - the DNA. When you have two copies, then the rest can divide. You copy the photo, then you get more glue and paper to hold the copy in the correct place.