For other uses, see Transition. Definition of transitions and transversions. In genetics, a transition is a point mutation that changes a purine nucleotide to another purine (A â G) or a pyrimidine nucleotide to another pyrimidine (C â T).Approximately two out of three single nucleotide polymorphisms (SNPs) are transitions.Transitions can be caused by oxidative deamination and tautomerization.or other uses, see Transition. Definition of transitions and transversions. In genetics, a transition is a point mutation that changes a purine nucleotide to another purine (A â G) or a pyrimidine nucleotide to another pyrimidine (C â T).
fringe benefit - an incidental benefit awarded for certain types of employment (especially if it is regarded as a right); a limousine is one of the fringe benefits of the job. perk, perquisite. benefit - financial assistance in time of need.
(b). .-For purposes of subsection (a), the term 'fringe benefit regulation' means a regulation providing for the inclusion of any fringe benefit in gross income by reason of section 61 of the Internal Revenue Code of 1986 [formerly I.R.C. 1954].. Pub. L. 95â615, Â§3, Nov. 8, 1978, 92 Stat. 3097, as amended by Pub.