Describe the main stages of combinational selection. What is the advantage of combinational selection over primitive? Give examples

The use of individual selection ushered in an era of combinational selection, where the main element is the crossbreeding of plant and animal forms that differ in their individual characteristics or in their complexes. With the help of combinational selection generations are obtained with good indicators, for example, yield or survival. With primitive selection, this will not happen.
Wheat:
The first stage is the cross between two forms
Getting first-generation hybrids
The second stage is the evaluation of offspring from hybrids of the first generation, repeating from the second to the eighth generation
The third stage is the selection of the best descendants, their assessment and testing for the crop and other signs
The final stage – the best offspring become a new variety

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