Mon Prof Augmenté
Chromosome Pairs
Age 15 · Biology
Most human cells contain 46 chromosomes arranged in 23 pairs. An extra copy of one chromosome causes a condition such as trisomy 21.
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Age 15: open this week
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In the picture
- A rounded cell membrane enclosing rod-shaped bodies.
- Two similar rod-shaped chromosomes lying side by side as one pair.
- Three similar rod-shaped chromosomes lying side by side, showing an extra copy.
Examples
- A set of 23 pairs of shoes, with one pair having a third shoe.
- A card deck sorted into pairs, where one card is duplicated.
Key takeaways
- Most human cells have 46 chromosomes, or 23 pairs.
- Trisomy 21 happens when chromosome 21 has an extra copy.
Quiz: Chromosome Pairs (Age 15)
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How many chromosomes do most human cells have?
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How are the 46 chromosomes arranged in most human cells?
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What causes trisomy 21?
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