Cytology and Genetics		, 
		том , 
		№ ,  , 
		doi: https://www.doi.org/
	
	
SUMMARY. A regular phenomenon and a simultaneous action of inbreeding and crossbreeding during propagation of many species with a number of evolution advantages are theoretically and experimentally proved. A hypothesis on the periodic change of inbreeding and crossbreeding in populations of certain species is further developed.
Ключові слова: