00:04Let's blow your mind with some so cool science time!
00:09If dominant genes override recessive genes, why are there any recessive genes?
00:14Well, it's a wicked cool question, and I got a wicked cool way of showing you that you're more of
00:19a mutt than you actually think you are.
00:21You know, unlike my ex-wife, who is definitely a mutt.
00:24Because, you know, I left her where I picked her up. At the pound!
00:29Because today, I'm going to show you the dominant and recessive genes that are in your face.
00:33And I bet you don't know how much you have of each.
00:35You know, like, I don't know why I go to Walmart on a bike, just to have the homeless people
00:39steal it!
00:42Alright, so go ahead and get yourself a picture of you, because we're going to label the dominant and recessive
00:47traits that you have in your face.
00:48If you have straight hair like mine, go ahead and label your hair with a R.
00:53And if you have curly hair, go ahead and label your hair with a D.
00:57If your earlobe is attached, like mine, go ahead and add an R to your ear.
01:01And if it's dangling, go ahead and add a D.
01:04If you have brown eyes like I do, go ahead and label your eyes with a D.
01:07If you have blue or green eyes, go ahead and label it with an R.
01:11If you have a thin nose like I have, go ahead and label your nose with an R.
01:15If you have a much flatter or broader nose, go ahead and label it with a D.
01:19If you have dimples in your cheeks like I do, go ahead and label that with a D.
01:23If you don't, go ahead and label it with an R.
01:26If your skin tone is a light melanin like mine, go ahead and label it R.
01:31If you have more melanin in your skin, go ahead and label it D.
01:34And of course, here's the reveal, the dominant and recessive genes in my face.
01:39I actually have more recessive traits in my face than I do dominant ones.
01:43So, if dominant genes override recessive genes, why do we have recessive genes in our face?
01:49Well, don't look at me. Take a closer look at this.
01:54When we think of genetic heredity, we usually think of genes like a light switch, where the gene is either
01:58on or off.
01:59But in reality, traits are more like a large panel of judges voting yes and no.
02:04And it's a combination of those votes, such as the brown color in my eyes.
02:08Dominant genes are those traits that allow an organism to survive, such as hairlessness in humans.
02:13This is a biological evolutionary advantage.
02:15Less hair means more likely to spot parasites and thus slows the spread of disease.
02:20Melanin production in the skin is what's known as an environmental evolutionary advantage.
02:24Since bare skin is exposed to more direct sun radiation,
02:27the production of melanin reduces the damage deeper in the skin layers.
02:31Those humans with those traits pass on their genes in greater numbers.
02:35Recessive genes still exist because they are only masked by dominant genes,
02:39and not deleted from the genetic code.
02:41Dominant genes usually produce a functional protein,
02:44while recessive alleles often make a non-functioning or weak product.
02:48A recessive trait might seem like it's a disadvantage or unneeded,
02:52but in reality it could prove to be an advantage if an evolutionary condition changed.
02:57Sickle cell traits are recessive, but carriers have resistance to malaria.
03:01Recessive genes increase genetic variation,
03:03which is essential for a species adaptation and survival over long periods of time.
03:07So now you know more about genetic alleles, you know?
03:10Being able to see the dominant and recessive traits in your face right at home is why science dominates.
03:18So now we're at the crisis.
03:19So this society can license to actual disease,
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