CORRELATIONS BETWEEN CHROMOSOME SEGMENTS AND FITNESS INDROSOPHILA MELANOGASTER III. DIFFERENTIAL GENETIC RESPONSES TO ZINC SULFATE AND SELENOCYSTINE

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Abstract
Genetic .times. environmental interactions are examined at an intrachromosomal level in D. melanogaster. With respect to 2 fitness components, egg production and egg-to-adult viability, evidence is provided that different segments of the X chromosome are affected differently by each of the chemical substances, zinc sulfate and selenocystine. The extent of a segment''s effect on a trait is not always paralleled by the extent of its association with the trait''s sensitivity to chemical treatment. Both attributes are functions of the genetical background. The degree of dominance of each segment is not always greater in the chemical environments, a finding inconsistent with Parson''s concept of extreme-environment heterosis.