Mon Prof Augmenté
Chromosomes in the nucleus
Age 14 · Science
Your genetic information is stored in the nucleus of each cell, packed into chromosomes made of DNA. A human body cell has 46 chromosomes arranged in 23 matched pairs, one of each pair coming from each parent.
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In the picture
- Nucleus: the part of the cell that holds the genetic information
- Chromosome: one long DNA molecule packed tightly into an X shape
- Matched pair: two chromosomes of the same size and banding, one from each parent
- DNA thread: a chromosome unwound into a long, thin, coiled strand
Examples
- You may have your mother’s eyes and your father’s hair because each chromosome pair contains one chromosome from each parent.
- A cheek-swab DNA test reads the DNA taken from the nuclei of cells inside your mouth.
Key takeaways
- Human body cells have 46 chromosomes in 23 pairs.
- Chromosomes are made of DNA and are kept in the cell nucleus.
Quiz: Chromosomes in the nucleus (Age 14)
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Where in a cell is your genetic information stored?
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How many chromosomes does a human body cell have?
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Where do the two chromosomes in a matched pair come from?
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