> You cannot "selectively breed" a fish gene into a tomato.
The actual results of breeding and natural selection, including particularly convergent evolution, suggest that its quite possible to achieve equivalent results to that by breeding, though the timescale required, if you are relying on natural mutation as your source of variation, might be very long.
Which is why selection breeding techniques that kick up the pace of mutation with radiation or chemical mutagens are still competitive means of developing new desired traits in a world that has gene editing.
The actual results of breeding and natural selection, including particularly convergent evolution, suggest that its quite possible to achieve equivalent results to that by breeding, though the timescale required, if you are relying on natural mutation as your source of variation, might be very long.
Which is why selection breeding techniques that kick up the pace of mutation with radiation or chemical mutagens are still competitive means of developing new desired traits in a world that has gene editing.