They identified at least eight different genes which would have to be transformed. My response was, "Very interesting, how can you transform eight genes at a time subject to selection when HIV, the fastest evolving replicator known can not evolve efficiently to 3 selection pressures targeting only 2 genes?"
Quite easily, actually. A population of millions (+-) of dinos over a span of millions of years can easily progress from undifferentiated tubular follicle collars developed out of the old keratinocytes being pushed out, through the inner, basilar layer of the follicle collar differentiating into longitudinal barb ridges with unbranched keratin filaments, while the thin peripheral layer of the collar become the deciduous sheath, forming a tuft of unbranched barbs with a basal calamus, through the helical displacement of barb ridges arising within the collar and the barbules pairing within the peripheral barbule plates of the barb ridges, creating branched barbs with rami and barbules, then through having differentiated distal and proximal barbules producing a closed, pennaceous vane with a closed vane that develops when pennulae on the distal barbules form a hooked shape to attach to the simpler proximal barbules of the adjacent barband, and finally, developmental novelties giving rise to additional structural diversity in the closed pennaceous feather.
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With millions of dinos over millions of years nature (mutation and selection) can do such things.
Your comparison with HIV is bogus since the drug cocktails are selected specifically to kill HIV and when the virus evolves a resistance to one another is put in its place. The evolution of feathers did not have that level of artificial pressure applied and had plenty of time to experiment with incremental developments on millions of genomes over millions of years.
You do believe in millions of years, do you not?
** Thanks
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Edited by AZPaul3, : No reason given.