Here's why:
* Polygenic Inheritance: Traits controlled by multiple genes are called polygenic traits.
* Additive Effect: Each gene contributes a small, incremental effect to the overall phenotype.
* Continuous Variation: This additive effect leads to a wide range of possible phenotypes, often forming a continuous distribution (like height or skin color).
Example: Imagine eye color. Instead of just brown or blue, we see shades of green, hazel, etc. This is because multiple genes influence eye color, leading to a wide range of possible phenotypes.
