Genetics and plant breeding is complicated because it needs mathematics and probability. The following is very simplified and disregards many complexities.
A tetraploid cross involves two parents each with 11 sets of chromosomes. Each set contains four chromosomes and because a plant typically has about 25,000 genes and each gene has several potential alternatives it is likely that all four chromosomes in each parent are different and that the two parents do not share any identical chromosomes. So a tetraploid seedling could be represented as having four different chromosome 1s, four different chromosome 2s, and so on to chromosome 11. That means at the very simplest level there are at least 36 x 36 x 36 x 36 x 36 x 36 x 36 x 36 x 36 x 36 x 36 genetically different siblings from a cross. That is a very large number. If one only produces several hundred siblings from a cross that would be a small sample of the millions that are possible.
Plant breeders routinely cross two plants to produce the F1 generation and then either cross two siblings F1 x F1 or when possible self-pollinate the F1 seedlings to produce the F2 generation. In much professional plant breeding the F2 generation is the first one where the different characteristics of the two parents are shuffled and recombined to produce new combinations. Self-pollinating Dragonfly Dawn produces the equivalent of an F2 generation of the cross Solar Blue Angel x Jamaican Love and may recombine any characteristics that differ in the two parents potentially bringing out any characteristics that were hidden in the original F1 generation plants.
