Do you accept as plausible, as most creationists do, that all horses, donkeys and asses (members of Family Equidae) might be related by common descent? How about dogs (Canidae)? If so, given your supposed requirement that a male and female must simultaneously appear with the same genetic mutations, how did various species of horses and various species of dogs develop, for instance, differing chromosome numbers? Heck, there's even a single SUBSPECIES of mouse, the common house mouse Mus musculus domesticus, which has some 40 different chromsomal races. And that's just in Northern Italy. But then I already told you about this.
Do you think those 40 some races of domestic mice are separate creations?
But, can they mate and crossbreed??