  In this paper, we derive the relationship between the weak basis invariants
(WB) related to CP violation responsible for leptogenesis and CP violation
relevant at low energy. We examine all the experimental viable cases of
Frampton-Glashow and Yanagida (FGY) model, in order to construct the WB
invariants in terms of left handed Majorana neutrino mass matrix elements, and
thus finding the necessary and sufficient condition for CP conservation.
Further for all the viable FGY texture zeros, we have shown the explicit
dependence of WB invariants on Dirac type and Majorana type CP violating
phases. In the end, we discuss the implication of such interrelationships on
leptogenesis.
