Constant selection for higher sugar content reached a natural limit in the genetic code and nothing could be produced with higher sugar content. The genes had a hard coded limit, and nothing would go past that. When they removed the imperative for sugar producing, the beets went back very quickly to the genetic mid-point.
The genes are “designed” to keep the organism at a steady point and all of the evidence shows this to be true. Look up all the attempts to change the fruit fly through actual mutations, and within a couple of generations, the genes would “heal” the genetic mutation forced into the system.
Even your Dr. Hamm acknowledges what he calls “microevolution” where mutations can change an organism is they give the organism better survivability. Bacteria become resistant to certain antibiotics over time. That is evolution. Science does not concern itself with macro evolution because it’s reached in the same manner as the resistant bacteria.
There are no “duckagators” half duck and half alligator. That’s a tired misrepresentation put up by creationist pseudo scientists to disprove evolution in the fossil record. There are, however, fossils of small dinosaurs with feathers, small dinosaurs that used their feathers to glide tree to tree, there are primitive birds with teeth and finally, fossils of many different kinds of birds existing at the same time as dinosaurs. That chain of fossils show the evolutionary path of birds, some of whom survived the mass extinction that killed off the other dinosaurs. That’s how transitional fossils work. Look it up in some other source than the creationist web sites that are more interested in making money off sincere Christians.