Multifactorial characters refer to traits or phenotypes that are influenced by a combination of genetic and environmental factors. These traits are not determined by a single gene but rather by multiple alleles and external conditions. A prime example of this is observed in the flower color of hydrangeas, which is significantly affected by the pH level of the soil.

In acidic soil conditions, hydrangeas typically exhibit a bluish hue, while in more basic (alkaline) soil, the flowers tend to display a pinkish color. This phenomenon illustrates how environmental factors, such as soil pH, interact with genetic predispositions to produce varying phenotypes. Understanding multifactorial characters is crucial as it highlights the complexity of inheritance and the interplay between genetics and the environment.

As we delve deeper into this topic, we will explore more examples and practice identifying the influences of both genetic and environmental factors on various traits.