Changes in size, shape, and color—or minor genetic alterations-is accepted by Creationists. It is called microevolution. It is not macroevolution: an upward, beneficial increase in complexity, as evolutionists claim happened billions of times between bacteria and man.
Not uniformly 'upward', no. But yes, an increase of complexity.
But we *don't* expect to see major increases of complexity as what you would call macroevolution in the short time periods we have been studying this stuff. Any time period less than the *short* period of, say, 50,000 years is going to be way too short to see major changes.
So, no, we don't expect to see such changes in our 'breeding experiments'.
On the other hand, we also see no *barriers* to the small changes adding up over time to produce big changes.
A good analogy is how languages change over time. If you go back 2000 years, there was no English language. Even if you only go back 800 years, the ancestor of English was so different as to be a different language.
In each generation, the change in the language was small enough that the speakers did not notice the changes. But, from the Old English (a very different language) came the Modern English we are writing in today.
And, for example, in the last 2000 years, we see the 'evolution' of Spanish and French from the old Latin language. At no point was there a first 'French speaker'. At each generation, everyone understood those around them. Yet, over longer periods of time, the languages change and new ones appear.
The same happens, only much slower, with biological evolution. The changes in each generation are small. In fact, even if you look over hundreds of generations, the changes are small. But, when you look at longer time periods, the changes are large and we see these changes in the fossil record.