The Crk/CrkL binding capability may have only evolved in virus strains that over-induce this antiviral signaling module to suppress its detrimental action.
It is possible that perchlorate reduction may have only evolved in a common ancestor within the Proteobacteria and was subsequently lost in multiple genera, but a more parsimonious theory is that perchlorate reduction evolved recently and has been transferred horizontally.
In other words, some alleles may only adaptively evolve when present within a specific sex, but when found in the reciprocal sex they are effectively neutral or "hidden" from selection (Gibson and Dworkin 2004; Dworkin 2005; Kuttner et al. 2014).
We can only evolve.' 'Yeah, that's right.
"Men only evolve with a gun at their head".
Because you can only evolve in peace.
Riolu can only evolve in sunlight.
Clamperl will only evolve when traded.
Seadra can only evolve using this method.
I therefore assume that RNA polymerase activity only evolved after protein translation, although RNA as a cofactor for abiotic ligation may be needed.
