Modelling natural selection
These practicals focus on particular examples evolution by natural selection, over school year timescales, and will help students to understand the bigger picture.
Selection in action - peppered moths
Use web-sourced material, maps and population data to explore the industrial melanism of Biston betularia (the peppered moth).
Selection in action - banded snails
Use presented data about the frequency of different varieties of snails to make deductions about selection pressure and changing populations.
Develop practical skills of scientific enquiry in an investigation of living brine shrimps – Artemia salina. Consider evidence that supports Darwin’s ideas about sexual selection.
A simple model for natural selection
Pick grains of coloured rice from coloured vermiculite as a model for natural selection. Follow the change in the characteristics of a population over a number of generations.
A model for natural selection – spaghetti worms
Investigate natural selection using ‘worms’ made from cooked spaghetti of different colours, observe which ones birds prefer to eat and monitor how ‘populations’ change over time.