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Due to the direct interaction between enzyme and substrate, the amylase  system can provide valuable information on the relationship between  homozygosity and developmental homeostasis under a changing environment in  several Drosophila species, The adaptive significance of the relationship  between genetic variability and environmental change manifests through the  well-known polymorphism of the amylase locus (Amy). We examined the effect of  gradual and abrupt changes in starch concentration in the nutritional  substrate, on the developmental time, egg-to-adult viability and phenotypic  plasticity in the progeny of Drosophila subobscura that was homozygous for  “fast” (AmyF/AmyF) and “slow” (AmyS/AmyS) Amy alleles. Our findings show that  gradual and abrupt nutritional changes exert a significant effect on  developmental time and viability. A high heterogeneity among genotypes in  fluctuating asymmetry (FA) and no direct association between FA and fitness  components under the two experimental regimes of environmental change were  observed

archives of biological sciences

Adaptive significance of amylase polymorphism in drosophila, XV: Examination of genotype-by-environment interactions on the viability, developmental time and stability of drosophila subobscura homozygous for Amy during exposure to nutritional changes