* Multiple Genes: Hair texture isn't determined by a single gene, but by multiple genes that interact with each other. This means there are many possible combinations and outcomes.
* Environmental Factors: Environmental factors like nutrition and hair care can also influence hair texture.
* Continuous Variation: Hair texture is a continuous trait, meaning it doesn't fall into just two distinct categories (straight vs. curly). There's a wide range of possibilities, including wavy, coily, etc.
Instead of thinking in terms of simple dominance, it's better to understand that:
* Different combinations of genes can lead to different hair textures.
* The inheritance of hair texture is influenced by multiple genes and environmental factors.
So, if two parents have straight hair, it's still possible for them to have a child with curly hair if they carry the genes for curly hair.