Ava and Alexis McClure are not just great YouTubers, but identical twins! I visited them to talk about what it means to be an ...

doctor-explains-twins-to-twins-ft-the-mcclures

Doctor Explains Twins to Twins ft. The McClures

- Hi everyone. My name's Ava. - And my name's Alexis. - And we are the McClue twins! (upbeat music) - Okay, Dr. Mike. As
you can see we're twins. - I could see that. - Yeah, because you have eyes. - And? - Because you're a doctor. - You're a doctor. - I'm a doctor. - I think you can tell. - So you're going to tell
us what really twins are. - Do you know there's actually
two types of twins, right? - Yeah. Fraternal twins. - And? - Identical twins. - Which one are you? - We're identical. - You're identical? No, are you tricking me? - No. - No, I know you're identical. I'm joking. So, twins are obviously
born on the same day. - Yeah. - Pretty much the same time. - Yeah. - Sometimes one comes out first. Who's the older one? - Me. I'm one minute older. - That means she's an old lady. - Does that make you stronger? - Yeah. - No, that makes me stronger. Because I got more time
to develop my muscles. - The difference between identical
twins and fraternal twins is identical twins are in
the same fertilized zygote. Like a goat, the animal. But you put zy before it. Zygote. - Zygote. - So one egg. One sperm goes
in and then it splits in two. But its from the same egg. - But fraternal twins... - Are two separate eggs. So if Mama Bear dropped two
eggs and both got fertilized that would be fraternal twins. - So we're squished together? - So you guys were
basically squished together in Mama's belly. As identical twins. When you come to see me as a doctor, well when the mom comes
to see me as a doctor, we measure the mom's stomach to see what the approximate date is of the pregnancy. - Oh so when it's going to come out? - Yeah. And we do an ultrasound. You
know what an ultrasound is? - And you get a heartbeat. And you get a heartbeat. How do they know if it's a boy or girl? - When we do the ultrasound? We can actually see the body parts. But its not always right. It's imperfect sometimes. So sometimes we think it's one, and it turns out something else. Because science is interesting. - Yeah it is pretty interesting. - Well so you know you can't
be a brother and a sister and be identical twins. Because identical twins
share the same DNA. - A brother and a sister are like - Fraternal. So you can have a brother
and a sister that are born at the same time but they come from different eggs. So they have slightly different DNA. But you guys have the exact same DNA. - What's a DNA? - You don't know what DNA is? - No. - Can I teach you? - Yeah. - You know what instructions are? - Yeah. - Okay so, your body needs instructions. Every little cell in your
body needs instructions on what to do. - And your brain does that. - The DNA gives it the instructions. The DNA is the genetic instructions. - Because what tells your brain? - Exactly. To become a brain. Well what tells your skin to be your skin or your nails to become your nails. Or your hair to become your hair. - You might become arms on your face! - Or my eyes to see! - Exactly. So you need instructions. So this is really cool right? Your body, in order to make
copies of the DNA, right, it constantly makes copies so you can get more and more cells, right? So if you get a cut, it
heals, more cells come. The cool part about this
is sometimes your body makes mistakes when it
makes copies, right? - Mhm. - But then your immune
system usually fixes it but sometimes the mistakes stay. So for example, do you see these
freckles that I have on me? - Yeah. - Those are basically little
mistakes that my skin made. Right? No big deal. Do you know what we call these mistakes? - No. - Mutations. Have you heard that word before? - No. - So these mutations are
usually harmless. Right? - Mhm. - And the difference
between you and you sister, like for example, maybe one
of your toes is different. Even though you have the same DNA, some things might be slightly different because of a little mutation. - Do I have any of those? - I have one in between my toe. - Here, here. Like you have it
a little bit here. See this? - Oh but, right there. - Oh there. Right there. - Yeah, right there. - Yeah see, you don't have one of those. That's a scar. How did you get that? - I fell. I scraped myself, my skin off. - And look, this is from door. - [Dr. Mike] Ooh. That hurts. - Why do the babies kick? - Because they want to. - Or maybe they're, like, boxing. - Yeah! Maybe they're doing Taekwondo. - They're trying to fight! - They're not going to hurt each other. They're so little. And everything is soft and gooey in there. There's padding. - Wait do you mean it's
not just.. It's empty? - No it's not empty. There's like fluids. - Do they float? - Yeah. (Ava gasps) Do you guys have the
cellphones that can open up with your fingerprint? - No, no, no. Only the iPad. - Yeah. - Oh, the iPad. So you know you can't
open your sister's iPad. - Because it's different. - Why? - Fingerprint. It's a mess up! - It's a mess up and I'm going to tell you another cool fact. - When you're inside
your mama's belly, right? You guys have to compete with
space, you're moving around. One person has more room. One has less room. Because of that, things change. Remember, your DNA, your
instructions, are exactly the same. But because of the environment and because of those mistakes
that sometimes can be made, even your fingerprints
are slightly different. Let's say if I test
your hair and your hair, it would be identical. Yet, when I look, like
at your freckles here, you have one freckle that you don't have. And then you have a freckles
that you don't have. But yet you have the same instructions. You came from the same egg. - We did? - Yeah. - Wait, we were in the egg? - You were. - How did they make a baby? - I don't know! That's a
question for Mama Bear! - A baby making dance! So that's why we lost teeth but we didn't lose the
same part of the teeth. - Because the environment. And how much space you
had in your mom's belly and how much you're
brushing your teeth now and the foods you eat now. All of that changes everything. - The breath just smell like stinky. - Just like my sister's
a little bit taller. - Who's breath is stinky breath? - [Ava] My sister. - [Alexis] My sister's. - Who has the stinkiest
breath, raise your hand. - You! - No, not point! I said raise a hand. You! - No! - Raise your hand. - Fine. - Yeah! - That's only because I'm old. - Yeah. You do have
pretty disgusting breath. - Sorry. - So an identical twin is two people in the same egg and fraternal twins are
people that separate. - Yes. Do you know how many,
out of 250 pregnancies, how many of them will be twins? Identical. If you had to guess, out of 250. - 100. - A thousand. - What? Out of 250? - Oh no, no, not a thousand. - 200. 259. - 50. - Okay. It's one. (Dr. Mike laughs) - Mike, if you're so smart, then do you think you can tell us apart if we're dressed the same? - Yeah man. - I think so. If I can use my stethoscope
to listen to your brains. - Nah, don't do that. - Okay. - Okay, try to tell use apart. - But you're not dressed the same. - Wait, close your eyes. - It's time to play Guess That Twin! Oh no, this is hard. Okay. First, I'm going to tell a joke. (giggling) Knock knock. Peanut butter jelly. - Cover your mouth! - Now you're covering your mouths too? This is crazy. I have to judge based on your eyes? - And nose! - If I guess it wrong, I
have to do twenty pushups. - Actually, okay yeah. - If I guess it right, you
have to do twenty pushups. - Ava stop! Ava! - Okay. - [Woman] You just told her! - I think Ava is sitting right here! - No! - I'm confident. - Yes! You win. - Let's do it again, let's do it again. - No, I got it right! I want my pushup! Pushup! - [Woman] You know what I fell for? She's saying, Ava stop. I'm like, you're telling on yourself! - Yeah. - But she was trying to trick you. - Five, six, seven. - Wow, they're strong. I can tell you how I knew. - [Woman] How'd you know? - Because the feet were exposed. - Because I had this, remember. - [Woman] Yeah, you told him. - Yeah, she told me about the door. - [Woman] That's how you
know he was listening, girls. - [Alexis] Subscribe. - [Ava] So thank you for watching. - [Alexis] Ava! Subscribe. Turn on the notifications. Ring the bell, put a heart. Thumbs up. - Yes. And subscribe to Dr. Mike! - And us! - And Mike and yeah that's it. - Thank you, bye! - That's it. (upbeat music)

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