* Features are complex: Most features, like eye color or height, are not controlled by a single gene. They are influenced by many genes working together, along with environmental factors.

* Multiple alleles: Even for features controlled by a single gene, you have two copies (alleles) of that gene, one from each parent. These alleles can be different, leading to various combinations and expressions of the feature.

Example:

* Eye color: While often simplified, eye color is influenced by multiple genes. Even if we focus on one major gene, you have two copies. One might be for blue eyes, the other for brown eyes. This could lead to brown eyes (if the brown allele is dominant), blue eyes (if both are for blue eyes), or a mix like green or hazel.

So, instead of a set number of genes per feature, think about:

* Multiple genes: Many features are controlled by multiple genes.

* Allele combinations: For a single gene, you have two alleles, and their combination determines the feature's expression.

* Environment: Factors like diet, exposure to sunlight, and lifestyle can also influence how genes are expressed.

Understanding how genes interact is a complex and fascinating field within genetics!