look at the color... if its bright and colorful its a male. if its colorless its a female.
Yes they will.
Yes, but only when the male/female is too old or too young.
The male of the species has brighter colours and is a much larger fish than the female
The only time a male and female betta or fighting fish should be together is when they breed. Otherwise it's better to separate them before one or the other dies.
If you are talking about reproduction then that would depend upon the genetics of the breeding pair. A none crowned fish (male or female) may carry crowned genes and throw some crowned young.
The male will only put up with a female while he is courting and breeding with her. Once the spawning process is over he will kill her if she is not removed from the tank.
None, they are dominant creatures you can rarely put them in a tank with another fish. Not sure about a female one with a male but still not best to be tried with. ;)
Nothing happens when you separate them. Nothing in particular anyway.
All animals can reproduce. Bettas are no exception. When a male and female are left together under the right conditions, they will spawn.
Because it's a shortfin male betta. There are such things, and the problem with them is they look a lot like females.
Yes, you can just not have 2 male bettas together.
Swordfish often fight each other for the right to mate with females or for territory. These fish are very large and very territorial and will often even fight with humans who enter their area.