Main content
Chromosomes and genes
Genes are located in the chromosomes of cells, with each chromosome pair containing two variants of each of many distinct genes. Created by Khan Academy.
Want to join the conversation?
- who else didn't sing along with her(33 votes)
- Me, i didnt sing along(15 votes)
- Maybe someday, We'll dye our selves purple or blue.(31 votes)
- This is very possible, if we started having increased copper in our skin cells we would look blue.(7 votes)
- how to become her star student;
step 1. Get a puppy
step 2. Learn how to change it's deoxyribonucleic acid to be pink
step 3. make more of them and breed them
and there you have it, you are now her favorite student ever!
XD(24 votes) - So if there is only one parent who had a lot of diseases, does that mean the child will get some of the diseases as well?(11 votes)
- Possibly. It depends(6 votes)
- How many chromosomes can that dog have(7 votes)
- A puppy can have 1,000 Chromosomes!(11 votes)
- Quick question: since we get 23 genes from both of our parents. How come we only give 23 genes to our child but we get 46 genes from our parents?(5 votes)
- because you have two parents(6 votes)
- What is a molitysilya organism (it is said in the video above)?(5 votes)
- What the narrator said is 'multicellular organism'. It means an organism that is made up of more than one cell.(7 votes)
- Why did she start singing at1:43?(7 votes)
- Her singing it cant help you rememberit(3 votes)
- i feel like making a puppys fur pink would be bad. because what if we mess up other genetics and make it have a bad life?(7 votes)
- Who else learned about DNA from watching the Jurassic World movies(6 votes)
Video transcript
- [Lecturer] This is a super cute puppy. He has a pink tongue, black fur, and very friendly personality. We know that when this puppy grows up, he will have a healthy
weight of about 70 pounds, he will love to play fetch, and enjoy snuggles with his human family. We know this because these traits are typical of his breed, Labradors. But where do these traits come from? In this video, we're gonna find out. But first, let's start at the beginning. What exactly are traits? Traits are specific
observable characteristics. They can be physical, like
our puppy's eye color. They can be behavioral, such as a dog being
more or less aggressive towards strangers. Or they can be health
related, such as a dog's risk of developing a certain disease. Traits are passed from
parents to offspring. This is why our puppy looks
so similar to his parents who were also Labradors. But, how does this occur? Well, traits are passed on
from one generation to the next through the inheritance of genes. Genes are pieces of hereditary material that are passed from parents to offspring. Genes are found inside
of an organism's cells as part of structures called chromosomes. In multicellular organisms, chromosomes are found
inside the cell nucleus. Chromosomes are often shown
as X-shaped structures like this one. Each chromosome is a structure that contains one long molecule
of DNA, which stands for ♪ Deoxyribonucleic acid ♪ All right, sing it with me. ♪ Deoxyribonucleic acid ♪ Or DNA, for short. Here's a model showing a small
stretch of a DNA molecule. You can see that it's made up of lots of different atoms represented
by these colored balls. The DNA molecule in a
chromosome is like this, but much, much longer. A chromosome's DNA molecule is coiled up in an organized way. This diagram shows what
the DNA would look like if it were stretched out. This allows us to see where a chromosome's genes are located. Genes are specific stretches
of a chromosome's DNA molecule. Each chromosome's DNA can contain hundreds or even thousands of genes. And in multicellular organisms, each cell contains multiple chromosomes. It's the collection of
genes and chromosomes that contain the information about all of an organism's
inherited traits. Like our puppy here, his
chromosomes contain thousands of genes to help him determine
his coat color, eye color, and all the other traits he
inherited from his parents. So our puppy must have one or more genes that caused him to have black fur. If he had been born
with different versions of the fur colored genes,
he may have had yellow or brown fur. Heck, maybe one day
someone will figure out how to change a puppy's DNA
so that he has pink fur. And who knows? Maybe you'll be the
geneticist to make it happen. That's it for today. Thanks for watching. And I hope to be seeing some
pink puppies one day soon.