For this purpose, half-diallel crosses among seven diverse parents were made.
David was a recipient of the Purple Heart, Air Medal, Air Force Commendation Medal, and three Distinguished Flying Crosses, among other decorations.
Basal sauropodomorph eggshell microstructure and their respective Sinemurian localities (crosses) among the Rhaetian (green) to Sinemurian (red) global record of sauropodomorph fossil sites (circles).
Although mice are the most widely used mammalian model organism, genetic studies have suffered from limited mapping resolution due to extensive linkage disequilibrium (LD) that is characteristic of crosses among inbred strains.
In breeding practice, the parental lines with high lysine content, especially the female line, are the genetic basis, and diverse crosses among parents in different heterotic groups provide a wide platform for selecting both high yield and lysine content in the progenies.
"The Alaska Highway is the legendary road of the north," Syd Cannings, a zoologist at the Yukon Conservation Data Center, writes in a coming book on the ecosystems the road crosses — among them the Rockies (and the Continental Divide), the Yukon River and the St. Elias Mountains (which include the highest peak in Canada).
Hybrid weakness is also apparent in many other plant species including Arabidopsis thaliana (Bomblies et al. 2007), Phaseolus vulgaris (Shii et al. 1980), interspecific crosses among Gossypium (Lee 1981), and interspecific crosses among Nicotiana (Tezuka et al. 2007).
Furthermore, Mgonja et al. ([1994]) reported the partial dominance and preponderance of additive gene effects for mesocotyl elongation using diallel crosses among 6 rice cultivars.
We produced crosses among these three cultivars and confirmed that the F1 hybrids from the cross between P.T.B.7 and P.T.B.10, and those from the cross between P.T.B.7 and A.D.T.14 showed the weakness symptom, as reported by Oka (1957) (Fig. 1).
The other model suggests allelic interaction: a hybrid necrosis symptom observed in interspecific crosses among Gossypium was explained by interlocus and intralocus interaction, shown respectively by the dominant Le 2 dav gene from Gossypium davidsonii at Le 2 locus and Le 1 and/or Le 2, dominant alleles from Gossypium hirsutum at the Le 1 and Le 2 loci (Lee 1981).
For this study, we first produced crosses among cultivars carrying the weakness-causing allele on the HWA1 and HWA2 loci to confirm the phenotype of the hybrid weakness and the genotypes of the cultivars on the two loci, as reported earlier.
