[PeterPrinciple]

Evolution is a well-understood factor of biology, which affects all life and will continue to shape life for as long as life continues.

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No it is not. What we used to call gene expression (recessive) is now called mutation. The genetic information is not new, not mutated, it already exists and is finally expressed. The words have changed in culture and science to be politically correct.

Too many people have gotten their scientific information from teenage mutant ninja turtles.....................

[exDemMom]

No it is not. What we used to call gene expression (recessive) is now called mutation. The genetic information is not new, not mutated, it already exists and is finally expressed. The words have changed in culture and science to be politically correct.

Honestly, I do not know what you are referring to.

A mutation is a change in the DNA sequence. There are different kinds of mutations, and different ways that mutations happen, but they all result in changes to DNA sequence. This is not the same as dominant and recessive traits.

DNA is represented by the letters G, A, T, C. So, a DNA sequence might start out like this:

G G A G C G T T A C

but after mutation, could become any of the following:

G G C G C G T T A C (point mutation)
G G A G C C G T T A C (single base insertion)
G G A T G C G T A C (sequence inversion)
G A G C G T T A C (single base deletion)
G G A G C G T T A C T T A C (sequence duplication)

Etc. There are infinite ways mutations can manifest.

Dominant and recessive refer to the expression of genes. Some forms of a gene are "stronger" than other forms, and so if one copy of each form of the same gene is present, only the "strong" (dominant) one will be seen. This is why a person with a gene for bloodtype A and a gene for bloodtype O will have bloodtype A. However, a person with a gene for A blood and a gene for B blood will express both genes equally and have AB bloodtype, because A and B are equal to each other (and dominant to O).