Figure 1: The chromosomal trait and appearance of C. auratus red var., C. carpio, and their diploid and tetraploid hybrid offspring.

(A) 100 Chromosomes were observed in C. auratus red var. (B) 100 Chromosomes were observed in C. carpio. (C,D) After hybridization, F1-F2 diploid hybrids (C) and F3-F25 allotetraploid (D) were obtained. The observation of chromosomes showed that duplication of genome was occurred in F3-F25 relative to F1-F2.