Before the 1900s, Inheritance Was Thought to Be Blended

Essay

Before the 1900s, inheritance was thought to be blended. In other words, a father who was tall and a mother who was short would often have children who were of medium height. Indeed, this is often seen. As another example, a father with dark skin and a mother of lighter skin will often have children who have skin tones intermediate between their parents. How is this explained in light of modern genetics?