Помогите решить задание по физике

Посмотри в интернете цену на поезд между этими городами.Докакого города им бы хватило денег

When Mendel crossed a tall pea plant with a short pea plant, the first generation of offspring were always _[blank]_. When Mendel crossed the offspring with each other, the distribution was about _[blank]_% tall and _[blank]_% short. 

Which observation led Mendel to the idea that traits were controlled by more than a single factor?