Using the dog kind as an example, we can see the amazing variety that was programmed into the DNA from creation. Using basic genetic principles and operational science, we can understand how the great diversity seen in the dogs of the present world could have come from one pair of dogs on Noah's Ark. Using the genes A, B, and C as examples of recessive/dominant traits in dogs, if an AaBbCc male were to mate with an AaBbCc female, there are 27 different combination (AABBCC....aabbcc) possible in the offspring. If these three genes coded for fur characteristics, we would get dogs with many types of fur-from long and thick to short and thin. As these dogs migrated around he globe after the Flood, they encountered different climates. Those that were better suited to the environment of the cold North survived and passed on the genes for long, thick fur. The opposite was true in the warmer climates. Natural selection is a key component of the explanation of events following the Flood that led to the world we now see.
This type of speciation has been observed to happen very rapidly and involves mixing and expression of the preexisting genetic variability. Not only does natural selection select from already existing information, it causes a loss of information since unfavorable genes are removed from the population. Mutations are not able to add new information to the genome. Not a single mutation has been observed to cause an increase in the amount of information in a genome. The difference in groups of similar organisms that are isolated from one another may eventually become great enough sop that the populations no longer interbreed in the wild. This is how new species have formed since the Flood and why the straw man argument set up at the beginning is a false representation of creationist interpretations.
https://www.youtube.com/watch?v=7R-vDUyv4Ak
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