A study on genetic variability in tomatoes was conducted with 26 different types of tomatoes. The researchers wanted to see how well the tomatoes grew and produced fruit, and to understand the genetic differences between them. They found that the shape of the fruit had the highest genetic variability, and that traits like plant height and fruit shape were highly heritable. This means that these traits are mostly determined by genetics rather than the environment. The researchers also discovered that plant height and fruit shape had the highest potential for genetic improvement.