Читать книгу Principles of Plant Genetics and Breeding - George Acquaah - Страница 286

The subsequent effect of hybridization, which is often the reason for hybridizing parents by breeders, occurs in the F₂ and later generations. By selfing the F₁ hybrid, the parental genes are reorganized into new genetic matrices in the offspring. This occurs through the process of meiosis, a nuclear division process that occurs in flowering plants. Contrasting alleles segregate and subsequently recombine in the next generation to generate new variability. Furthermore, the phenomenon of crossing over that leads to the physical exchange of parts of chromatids from homologous chromosomes provides an opportunity for recombination of linked genes, also leading to the generation of new variation.