HETEROSIS IN TRIBOLIUM CASTANEUM

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Abstract
The descendants of 2 inbred lines of Tri-bolium castaneum produced by continuous full sib matings for 37 and 34 generations respectively and of diverse genetic origin were crossed and heterosis observed. Heterosis, expressed as F1 means exceeding the mid-parent mean, for body (pupa) weight of males and females was 5.0% and 3.7%, respectively. It was considerably larger (279.3%) for egg production measured 14 days post pupation. A maternal effect was found in male offspring pupa weight. Males were heavier when their dams were from the heavier parental line. The data indicate that sex linkage was involved for genes determining pupa weight which could account for the maternal effect observed in males.