The explanation for heterosis phenomenon is based on ideas: (i) every trait of an organism depends on many genes. ... Therefore, I propose that the decrease in individual genetic diversity is the cause the of depression and the increase in individual genetic diversity is the cause of heterosis.
What is heterosis and its importance?
Abstract. Heterosis or hybrid vigor is a phenomenon where hybrid progeny have superior performance compared to their parental inbred lines. This is important in the use of F1 hybrid cultivars in many crops and vegetables.
What are the physiological causes of heterosis?
Physiological Causes: (i) Greater initial capital hypothesis: This hypothesis was proposed by Ashby (1930). He studied the physiology of inbreeds and hybrids of maize and tomato and concluded that hybrid vigour is due to an increased initial embryo size.
