What are the characteristics of conventional breeding and molecular breeding?

1. Conventional breeding method is a traditional breeding technique commonly used in breeding work. Generally, it refers to natural variation selection breeding method and hybrid breeding method. In one or several varieties or groups, the method of selecting excellent natural variation to cultivate new varieties is called natural variation selection breeding. It can be divided into individual selection breeding (systematic breeding) and mixed selection breeding. Selective breeding has a long history and is simple and effective, but it can only be used when there are excellent variations in nature. Cross breeding is a common basic and effective breeding method. It is a method of creating hybrid population variation through sexual hybridization and cultivating new varieties through selection. Molecular breeding is a breeding method that applies genetic engineering to breeding and cultivates new varieties with certain requirements through gene introduction.

2. Molecular breeding method, also known as genetic engineering breeding method, is to recombine exogenous (extracted from other organisms) or synthetic DNA (or RNA) molecular fragments at the molecular level by artificial methods, and then introduce them into the cells of "recipient" organisms through certain vectors to combine with the original DNA, so that the offspring can "express" the genetic traits controlled by the genetic information carried by the newly introduced DNA (or RNA), thus