Which of the following practices in agriculture and animal domestication demonstrate a rudimentary understanding of heredity and genetics? A)Primitive societies were more likely to kill wolves that were too aggressive and keep the less aggressive ones as pets and hunting companions B) Nomads selected the chickens that laid the most eggs for breeding. C) Farmers planted seeds from trees that produced the largest, sweetest fruits and not from trees that produced the smallest or inedible fruits. D) When foraging for edible plants, gatherers avoided grasses with no nutritional value. E) To prevent injury to themselves, ranchers removed the horns from bulls after birth.

The key to understand how heredity and genetics work is to select one specific trait in a particular organism (plant or animal), and handle a way that organism with the trait of your interest could be more likely to reproduce and consequently be more likely to spread that particular trait of interest to their offspring. In the case of letter A, the wolves that are less aggressive will become more common than the more aggressive ones. In the case of letter B, the chickens that produce more eggs will be more common than the chickens that produce less eggs. In the case of letter C, the seeds from better fruits (big and edible) will be more common than poor quality ones.