Here's why:
* Genes provide the blueprint: Genes contain the instructions for building and maintaining an organism. They determine things like eye color, hair texture, and predisposition to certain diseases.
* Environment shapes the expression: The environment can influence how those genes are expressed. This includes everything from the food we eat and the air we breathe to the social interactions we experience and the stressors we face.
Examples:
* Height: Genes play a major role in determining height, but nutrition and overall health during childhood can also have a significant impact.
* Skin tone: While genes determine skin pigmentation, sun exposure can cause tanning and affect skin tone.
* Intelligence: Genetics contribute to intelligence, but education, social stimulation, and access to resources can also play a major role in cognitive development.
* Disease susceptibility: Genes can predispose individuals to certain diseases, but lifestyle choices like diet, exercise, and stress management can influence the likelihood of developing those conditions.
This interplay between genes and the environment is known as gene-environment interaction. It's a complex and dynamic process that makes each individual unique.
