How do wild plants and animals differ from their cultivated relatives?

How do wild plants and animals differ from their cultivated relatives? Why are there so many different plant varieties and animal breeds? What is the main technique used by humans to breed organisms with new properties? What new properties of organisms would you like to get? What properties cannot be obtained?

Cultivated plants differ in the severity of one trait (large juicy fruits with a high starch content, a high percentage of oil in the oil in the seeds), which is necessary for a person.

In different industries, only certain plant varieties are used.

Breeding is the sequential selection of plants with specific traits, followed by self-pollination to preserve the trait in the offspring.

Today, a significant part of humanity is experiencing hunger, therefore, plant varieties with a high content of protein, vitamins, fats are needed, it is important that they ripen quickly and be unpretentious.

It is impossible to get plant varieties that would create animal products (milk, meat).