A description of Mendel's work with pea plants to demonstrate dominant and recessive inheritance. Between 1856 and 1863, Gregor Mendel bred over 30,000 different plants, crossbreeding those with distinctive characteristics. Crossing pink and white-flowered pea plants produced all pink flowers in the first generation. However, in the second generation, the ratio of pink to white flowers was 3:1. This indicated that producing white flowers was a recessive characteristic masked by the dominant characteristic of the pink flower.
The clip could be shown towards the end of a topic about variation. The class can discuss the expression of genes shown in the clip and any other examples they may know of, for instance if both parents have dark brown hair, what is the most likely hair colour the child will have?