This is the second of the new invented GA operators. It is very similar to swap, but this time the swaping takes place in all the genes that have the same allele value. With the same W definition of above the formal definition reads as
In this operation also 
is finally replaced by 
.
For example if 8th and 12th genes are selected for exchange operation, all the genes having the same allele value will be changed: 3mmBefore exchange:
After exchange:
