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The relationship between chromosomes, genes and DNA is explained.

The genetics of gender are discussed. We see how sperm carrying X and Y chromosomes result in female and male offspring, respectively.
This clip is from:
First broadcast:
21 November 2008

Classroom Ideas

Use models to work with students on their understanding of DNA, genes and chromosomes. The class could take part in decoding activities, producing paper-chain proteins. Ask students to explain how a discrete characteristic, such as gender or tongue-rolling ability relies on the combination of genes from parents. Sex is a particularly clear example and differences between XY and XX chromosome combinations can be related to inherited diseases that tend to affect one gender.

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