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>>17097
>They have zero genetic formulas showing how gene X plus gene Z becomes gene Q
Do you understand what a gene is? A gene is a human-created abstraction. At the molecular level genes don't exist. All you have is a very long molecule consisting of a chain of base pairs. A base pair is one of two possible nucleotides, each of which may be in one of two orientations. A nucleotide is a submolecule made of either adenine and thymine, or guanine and cytosine. This is why a genome is represented as a string of ATGC. For example, the string "TTGAACT" is looking at one side of the double helix. Just as a side-node, if you were to look at the other side you'd see "AACTTGA", so they're equivalent strings.
The reason I'm explaining this is that, again, genes don't exist. If you want to think of a genome like a book filled with (seemingly) nonsensical characters, a gene is like finding a meaningful word in the middle. A mutation is not about taking two genes and smashing them together to get a new gene. A mutation is an alteration to the information stored in the genetic sequence. It happens at the molecular level. I could take the example from before and flip one of the links between the base pairs so that "TTGAACT" becomes "TTGTTGA". This is a mutation. Did the original string mean anything? Does the new one? We don't know, and it doesn't matter. What matters is that if the genetic information can change and the changes can accumulate, then the genetics of a population can drift arbitrarily far from its original form. If I do enough modifications to the string from before, I can eventually get the string "GATTACA", even though it doesn't exist in the original string. In the same way, mutations can pile up on a populations genome until novel features arise, or old features are discarded.
>Lungfish
I assumed you were referring to gills because the argument doesn't make much sense otherwise. The lungs of a lungfish are not wildly different from the lungs of a bird. What, you can accept that a coastline-dwelling amphibian can have flying feathered descendants who live mostly on trees, but a lung changing in structure slightly along generations is a bridge too far?