Humans typically have 46 chromosomes (23 pairs), but when cells accidentally develop 47 chromosomes due to an extra chromosome, this chromosomal abnormality can result in conditions like Down syndrome, where the extra chromosome alters physical and developmental traits.
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Prerequisite Knowledge
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Deep Dive
What Actually Happens When You Have an Extra Chromosome?
Added:Hey egg, let's make a baby [music] together. Wait, why do you have one extra chromosome?
>> That just means I'm special. Different isn't bad.
>> Hm, fair point. Let's go.
>> All right. All right. Do we have all the chromosomes in here? Um, 23 from the mom?
>> Here. Here.
>> Yep. Yep.
>> Yep. Yep.
>> Yep. Yep.
>> Yep. Yep.
>> We're all here. We're all here. We're all here.
>> All right.
>> Let me check you guys off. Um, 23 from the dad?
>> Yep.
>> Yep.
>> We all made it. We all made it.
>> 23. 23. Yep. Yep. Yep. Yep.
>> We're all here, man.
>> All right. That is a total OF 46.
>> YEAH.
>> THAT'S RIGHT.
>> [laughter] >> W- W- WHAT THE [ __ ] so damn funny? He's the extra chromosome. What?
>> He's the extra chromosome.
>> N- No, that can't be right. It's 47.
>> No.
>> It's 47.
>> Are you telling me I miscounted? IT'S 40 [ __ ] 7.
>> OH MY GOD. [screaming] >> NO. NO. NO. NO.
>> NO. Oh my god.
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