No, the sperm comes from both testicles.
If he has a testicle, there will be sperm.
Yes, as long as the testicle is functioning properly then you can reproduce with one testicle.
Not if only one testicle is removed. You can produce sperm just fine with only one testicle
Nope, each testicle both produces and stores the sperm.
The overall Count will be a bit lower, but if that testicle is healthy, the man will still be fertile.
It should not affect performance however may effect sperm count and reproductive capability.
Err... Assuming you have 2 testicles... 100% Divided by 2 = 50% So 50% in each testicle :)
Yep; half the sperm. Logical, right?
The testicle
Yes ... although the amount of sperm may not be sufficient to fully fertilize the ovaries.
One testicle can still produce millions of sperm. Your sperm output is more likely to be affected by other things (tight or too warm clothing, diet, alcohol, drugs etc).
Although it is possible to father a child if only one testicle is removed, some surgeons recommend banking sperm as a precaution in case the other testicle should develop a tumor at a later date.