genetic algorithm - select same parents in multiple Tournament selection -

i'm wondering if can select 2 same parents in 2 iteration of selection in genetic algorithm (in same population tournament selection).

can i?

a lot of these decisions made after experimentation one's particular software , domain.

of course 2 parents can generate more 2 children. may happen either because:

• crossover operator creates more 2 children;
• tournament selection picks repeatedly same parents (with simple steady state population common event).

generally it's not recommended create many individuals same parents because have "restricted trend" (what "too many" means debatable).

so can find form of prevention. apart checking explicitly "same parents" occurrence, there other techniques.

e.g.

• demetic grouping same parents can generate numerous offspring children compete among them.

• family competition replacement schemes different way of limiting amounts of multiple crossovers same parents.

• ...