midparent value

midparent value

the average value of a METRIC CHARACTER from two parents. Such values when compared with those of their offspring give a direct measure of NARROW-SENSE HERITABILITY.
References in periodicals archive ?
However, the RIL distribution for boll size appeared to be shifted toward the smaller boll size of the NM24016 parent, as indicated by a RIL population mean that was lower than the midparent value (Table 4).
Therefore, in order to test whether this character is inherited in an additive fashion, the mean density on hybrid leaves was compared with the midparent value (mean of the two parents).
Means for the two backcross populations are expected to be halfway between the midparent value and the two parental means, regardless of X-effects.
2] hybrids should equal the midparent value (average performance of the two parent populations).
For each cross combination (P1 x P2), hybrid performance (HYB), midparent value (MP), absolute midparent heterosis (MPH), relative midparent heterosis (MPH%), and relative better-parent heterosis (BPH%) were calculated as follows: MP = (P1 + P2)/2; MPH = HYB-MP; MPH% = (MPH/ MP) x 100; BPH% = (HYB-Pmax)/Pmax x 100, where Pmax refers to the higher performing or taller parent.
The six variables used in the model to describe the phenotype were midparent value (m), additive effects [d], dominance effects [h], additive x additive interactions [I], additive x dominance interactions [j], and dominance x dominance interactions [1].
1]) was very close to that of the standard low line A74/18/10 (Table 1) and much lower than the midparent value (387 g [kg.
For each trait, the midparent value for a cross was computed as the mean of the two parental line means averaged across environments.