SELECTION FOR PUPA WEIGHT IN <i>TRIBOLIUM CASTANEUM</i>. II. LINKAGE AND LEVEL OF DOMINANCE

Enfield, F. D.; Goodwill, R.E.; Braskerud, O.

doi:10.1093/genetics/62.4.849

Cited by 9 publications

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“…the heterosis is in the direction of lighter pupa weight and is significant (P < .05) except for the male progeny from the cross: RSI X CSI-5. This is in opposite directien to what has been reported in previous studies using related populations (ENFIELD 1966;ENFIELD et al 1969;GOODWILL and ENFIELD 1971). This apparent contradiction may be due to the presence of maternal effects.…”

Section: Tablecontrasting

confidence: 98%

“…This interaction can be separated into two orthogocal components each with s-I degrees of freedom. The one component, males X females (L), which is linear for the two inbred lines (CSI-IO-CSI-5), is identical to the male X female interaction in the North Carolina design I11 (COMSTOCK and ROBINSON 1952;ENFIELD et al 1969). In the absence of epistasis, this provides an unbiased rstimate of dominance variance.…”

Section: Experiments Imentioning

confidence: 99%

“…COMSTOCK and ROBINSON [ 1952) described an experimental approach which could be used to estimate the average level of dominance. This design (North Carolina Design 111) has been employed (ENFIELD, COMSTOCK and BRASKERUD 1966;ENFIELD et al 1969) to examine the importance of linkage and estimate the average level of dominance for the genes affecting pupa weight in Tribolium. KEARSEY and JINKS (1968) described an extension (the triple-testcross) to the North Carolina Design I11 which provides an unambiguous test for the presence of epistasis.…”

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AN ANALYSIS OF THE MODE OF GENE ACTION AFFECTING PUPA WEIGHT IN TRIBOLIUM CASTANEUM

Goodwill

1975

Genetics

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Triple-testcross experiments (Kearsey and Jinks 1968) were employed to investigate the mode of gene action affecting pupa weight in Tribolium castaneum. Their experimental design involves two inbred lines, the F1 progeny and a segregating population derived from the cross of the inbred lines. In the present experiments, four segregating populations were used. These populations included the F2 generation, a select line (SEL) and two relaxed select lines (RSI and RSII). In addition, all possible reciprocal crosses were made among the RSI, RSII, and SEL populations. It was observed that: (1) additive, dominant and epistatic gene effects all made significant contributions to the pupa weight of the progeny from all four segregating populations; (2) there was no evidence of either accumulation of epistasis as a result of selection in the SEL population or decline in epistasis as a result of removing selection pressure from the RSI and RSII populations; and (3) significant negative heterosis and maternal effects contributed to the pupa weight of the crossbred progeny of the RSI, RSII and SEL populations.

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Section: Tablecontrasting

confidence: 98%

Section: Experiments Imentioning

confidence: 99%

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