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We have developed a new evolutionary synthesis code, which incorporates
the output from chemical evolution models. We compare results of this new
code with other published codes, and we apply it
to the irregular galaxy NGC 1560 using sophisticated chemical
evolution models. The code makes important contributions in two areas:
a) the generation of synthetic populations with time-dependent star formation
rates and stellar populations of different metallicities; b) the extension of
the set of stellar tracks from the Geneva group by adding the AGB phases for
mi/M⊙≥0.8, as well as the low mass stars. Our code predicts
spectra, broad band colors, and Lick indices by using a spectral library,
covering a more complete grid of stellar parameters than previous models. The
application of the code to the galaxy NGC 1560 constrains the star formation
age of its stellar population at around 10.0 Gyr
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