A simple card sort of 16 choices (half and half) illustrated in colour, which I used with a lowest-ability Year 8 group.
It's all based on human characteristics, for example 'hair colour', 'height', 'having a tattoo'.
Some of the characteristics can be both inherited and environmental if you want to go a bit deeper.
My pupils really enjoyed it, and it started some interesting discussions about where some characteristics come from.