The best method to carry forward the maximum number of genotype/genes to the advanced generations against the force of natural selection

The best method to carry forward the maximum number of genotypes/genes to the advanced generations against the force of natural selection is the Single seed descent method.
The single-seed descent (SSD) method of inbreeding minimizes the amount of genetic sampling.
Single-seed-descent (SSD) is a modification of conventional plant breeding used by breeders to rapidly fix genes in breeding lines. As its name implies, SSD is the advancement of one randomly selected seed per plant through the early segregating stages.