However, if the male guppy in the breeding tank is a different strain than the male that originally mated with her, the fry may be a different color or shape than the fry would have been if she had stayed with the original male.
While guppy pregnant when put in breed tank?
Female guppies can store sperm for several months, so it is possible for her to become pregnant even if she was not put in a breeding tank until after she was already pregnant.