Human cells have 46 chromosomes that are placed into 23 pairs, with one chromosome of each pair coming from the father and mother separately. Discover what an extra or missing chromosome causes with information from a science teacher in this free video on physiology and the human body.
Did you know that in every little tiny cell in your body you have forty six of these. Hi, I'm Janice Creneti and I'm here to talk about how many cell, how many chromosomes are in an average human cell. Well, first of all what exactly is a chromosome? Well, a chromosome is a very long strand of DNA. DNA is a material that carriers your genetic information. It determines what your hair color is, your eye color, how tall you are in some cases, and that very long strand actually curls up on itself and creates something that's called a chromosome. Two DNA strands hooked together. It actually does sort of look like an X. Well, in the normal human body cell (and that's a body cell not a sex cell, we'll talk more about that in a second) you actually have forty-six chromosomes and they're paired up twenty-three pairs, kind of like a pair of shoes. One of these chromosomes has come from your mother and one of the chromosomes has come from the father. So that in a typical body cell half your genetic information comes from mom, and half your genetic information comes from dad. In the sperm cell and the egg cells that go to make a fertilized egg and eventually a human being, there's only half that number. So twenty-three and twenty-three put together we're back to the right number of forty-six. Now we said there was forty-six in a normal cell, sometimes like happens in nature things don't go exactly as planned. And human cells can wind up with an extra chromosome or a missing chromosome. An extra chromosome is what creates down syndrome, there's actually a third of twenty-one. Missing chromosomes like in Turner Syndrome can result in a woman being infertile and not being able to have children. So hopefully in your healthy human self you've got forty-sex chromosomes. I'm Janice Creneti and this is how many human chromosomes are in a human cell.