Where in the Cell Does DNA Replication Occur?

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DNA replication occurs in the nucleus of almost every cell in the body, and replication takes place when hair or nails grow. Learn about DNA replication, which creates two identical cells, with information from a biology teacher in this free video on science.

Part of the Video Series: DNA Structure & Testing
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Video Transcript

If you watch a modern detective story, you might see them scanning the crime scene for a drop of blood or a tiny hair. Something from which they can extract this material called DNA. DNA is the genetic material inside of your cell. I'm Janice Crenetti and I'm here to talk to you today about where in the cell does DNA replication occur. Well as a biology teacher for the last 20 years, I've taught my students this many, many, many times. Our understanding of DNA really have revolutionized our understanding of how the human body works. And it's even revolutionized the police crime investigations because now they can match the blood left at a crime scene with the DNA inside of a person. Makes it much easier for them to say yes, this person has to be the guy or no this person is probably not the guy because his DNA doesn't match. But where in the cell does all this DNA live and where in the cell does DNA replication occur? Well DNA is an instruction manual, that's it's only purpose, it's just there to be a guideline for the building of new cells. So the DNA is found inside the nucleus inside the cell of just about everybody in humans for instance. Red blood cells don't have DNA but just about every other cell does. So if you look inside the nucleus, inside the cell, you'll find these strands of DNA. When it's time for the cell to divide, let's say when your hair is going to grow or when your nails are going to grow or when a cut heals, that DNA has to replicate itself, in other words copy itself, that's what replication means. All of that stays inside of the nucleus. That nucleus will double in size because of the size of the DNA has doubled and then the nucleus and the rest of the cell can divide in half and create two identical cells. And that's how growth happens in a human body. Again, all inside the nucleus of the cell. Hard to believe isn't is, so much is going on in such a tiny space? I'm Janice Crenetti and this is where in the cell does DNA replication occur?


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