Genetics & Environment How does environmental factors influence the expression of the extension gene? February 9, 2026 by Riding Environmental factors can significantly influence the expression of the extension gene, which plays a crucial role in determining coat color in animals. By interacting with genetic mechanisms, environmental conditions can alter how genes are expressed, leading to variations in phenotypes. What is the Extension Gene? The extension gene, scientifically known as the melanocortin 1 receptor […] Read more »