Features of Recent Codon Evolution: A Comparative Polymorphism-Fixation Study

Table 2

Statistics of mutations 𝐶𝐺↔𝑇𝐺/𝐶𝐴 in eight CG-containing codons.

Codon	Polymorphism			Fixation
	CG→TG/CA	TG/CA→CG	Ratioa	CG→TG/CA	TG/CA→CG	Ratioa
ACG	282	141	2.00	89	245	0.36
TCG	193	61	3.16	52	121	0.43
CCG	282	115	2.45	87	225	0.39
GCG	271	81	3.35	75	180	0.42
CGA	88	12	7.33	17	14	1.21
CGT	106	53	2.00	14	25	0.56
CGC	163	29	5.62	47	22	2.14
CGG	215	68	3.16	65	65	1.00
Total	1600	560	2.86	446	897	0.50

aRatio of CG→TG/CA over TG/CA→CG changes.