1. Driving selection. Acts in changing environmental conditions. There is a gradual shift of signs in a certain direction. For example, the darkening of the wings of the birch moth during the darkening of tree trunks, due to the development of industry.
2. Stabilizing selection. It operates under constant environmental conditions. Increases the number of individuals with an average value of the trait, removes marginal deviations from the norm.
3. Tearing or disruptive selection. Acts in changing environmental conditions. Promotes the reproduction of individuals of both extreme forms. Before haying, dandelions with a high peduncle predominate, and after haying, forms with a low peduncle predominate.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.