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

Table 3

Mutation pattern on 𝐴|𝑈 dicodon boundaries.

	Polymorphism		Fixation
	A|T	A|G	A|T	A|G
T/C/G→A	328	613	300	507
A→T/C/G	228	269	229	517
𝑃-valuea	4.49×10^−5		7.12×10^−3

𝑃-values were calculated by χ ² test for 2×2 contingency tables. A|G dicodon boundaries were considered as control.
aNote the opposite pattern on A|U dicodon boundaries by polymorphism and fixation.