Betta tail type genetics are mysterious in some ways. The laws of genetics specifically state that when crossed, two genes do not mix, but average out and the most dominant shows. This is not true for bettas. Male Veiltail by Kirrie Female Veiltail by .
Bettas are completely underrated. Beautiful, tough, and often full of personality. Whenever someone asks me about what fish to buy as a beginner fishkeeper I ALWAYS recommend bettas. Probably my all-time favorite type of freshwater fish.