11. They are still threatened because of crossbreeding with domestic and feral cats. 12. It is capable of producing substantial hybrid vigor when used for crossbreeding . 13. His results of crossbreeding experiments on file with the Northern Nutgrowers Association. 14. Farmers have been crossbreeding plants for centuries to produce ones with desired traits. 15. Bread wheat is not naturally occurring and had to be developed through crossbreeding . 16. Crossbreeding between populations also often has positive effects on fitness-related traits.17. Jack Russell traits often remain visible despite this crossbreeding . 18. G . D . Karpechenko specialized in plant polyploid speciation during experimental crossbreeding . 19. Improvements continued to be made through crossbreeding with blooded Hereford and Angus stock. 20. The Beaglier became particularly popular through crossbreeding programs in Australia during the 1990s.
