Journal of Heredity

SUSTARSIC, DENNIS, L.;WOLFE, H., GLENN

doi: 10.1093/oxfordjournals.jhered.a109243pmid: 489950

Abstract Genetic variations in pituitary and serum luteinizing hormone (LH) levels and in the in vitro release of pitui tary LH induced by luteinizing hormone-releasing hor mone (LH-RH) in male mice were examined by diallel analyses. Analyses involved the four strains C3H/HeWe, C57BL/6We, 129/ReW1, and NAW/W1, and their 12 F1 hybrids. Measurements of pituitary LH, serum LH, and pituitary LH released into incubation media were carried out by radioimmunoassay. For all three characteristics, pituitary LH level, serum LH level, and induced LH release, significant differenceswere observed among the four strains utilized. The rank order of increasing mean values among all genetic groups was generally similar for the three characteristics, and this was reflected by significant positive correlations among means for the three traits. For each of the three characteristics nearly all crosses between strains resulted in F1 hybrid progeny with mean values that were lower than mid- parental means. Results of diallel analyses of variance showed that the bulk of the genetic variance for each of the three traits was additive. Additive genetic effects were significant for all three characteristics, and nonadditive genetic effects were significant for pituitary LB level and induced LB release, but not for serum LH level. Reciprocal effects were not significant for any of the three traits. Serum LH level was apparently more influenced by environmental variation than were the other two characteristics. This content is only available as a PDF. © 1979 AMERICAN GENETIC ASSOCIATION

MURPHEY, R., M.;TORRES PENEDO, M., C.;STORMONT,, C.;BAHRE, C., J.

doi: 10.1093/oxfordjournals.jhered.a109244pmid: 489951

Abstract Creole-like cattle blood types were compared with a mixed control group and Longhorn data using hemolytic and electrophoretic techniques. Among the hemolytic tests, the crucial B system analyses indicated that 1) the Creole-like animals were more similar to Longhorns than were the controls; 2) the three groups were different from each other; 3) the three groups were not mutually exclusive. Eleven new phenogroups were postulated. The remaining blood group systems and the electrophoretic tests raised interesting biohistorical questions but were generally less useful in discriminating among the three groups of cattle. This content is only available as a PDF. © 1979 AMERICAN GENETIC ASSOCIATION

DIETERT, RODNEY, R.;SANDERS, BOB, G.

doi: 10.1093/oxfordjournals.jhered.a109245pmid: 489952

Abstract The patterns of genetic segregation and developmental phasing of chicken fetal-leukemic antigen (CFA) are reported for the pigeon and duck. Pigeon RBC's lose two CFA determinants with development: CFA 6 between 6–7 days post-hatch and CFA I at 8–9 days following hatching. Duck RBC's undergo rapid phasing of CFA, with several determinants appearing and disappearing within a few days during embryogeny. Acquisition and loss of these determinants correspond with quantitative changes in the agglutinability of embryonic duck RBC's with rabbit antisera specific for CFA. The developmental appearance of CFA determinant 10 on pigeon RBC's was found to undergo genetic segregation in individual pigeons within two breeding populations. CFA 10 is first detected on pigeon RBC's between 33–34 days after hatching and its appearance appears to be under the control of an autosomal recessive gene. No segregation was observed for any CFA determinants in either the mallard or Pekin ducks. CFA 6 and 10 were found to be present as cryptic determinants on adult pigeon (lacking CFA determinant 10 (10−)) RBC's. Treatment with neuraminidase, but not trypsin or protease, exposed both determinants. Possible explanations involving the genetic segregation and developmental phasing of CFA in pigeons and ducks are discussed. This content is only available as a PDF. © 1979 AMERICAN GENETIC ASSOCIATION

LANE, PRISCILLA, W.;EICHER, EVA, M.

doi: 10.1093/oxfordjournals.jhered.a109246pmid: 489953

Abstract Data have been presented to show the linkages and most probable order of eight loci in LG XVI. The map of LG XVI is as follows: spa—3—ma—2—ft—1—soc—6—op—3—(Amy-l, Amy-2)—20—Va with the position of de known to be on the ma side of Va. Data from a 3-point cross with ma, Va, and the Robertsonian translocation, Rb5, showed no linkage with the centromere of Chr 12 with either end, ma or Va. We conclude that LG XVI is not carried on Chr 12, and preliminary data indicates it is most likely carried on Chr 3. This content is only available as a PDF. © 1979 AMERICAN GENETIC ASSOCIATION

RAJENDRA, B., R.;MUJEEB, K., A.;BATES, L., S.

doi: 10.1093/oxfordjournals.jhered.a109247pmid: N/A

Abstract Two anatomically different macrosclereid arrangements in seed coats of Vigna sinensis, V. sesquipedalis, and F1 through F4 progeny from the interspecific hybrid are described. Macrosclereids arranged perpendicular to the cotyledon (PC) were shown dominant to the parallel to the cotyledon (pc) arrangement. A 3:1 ratio indicated a single gene was responsible for the two macrosclereid traits. The results are discussed in relation to other genetic reports and the ramifications for future experiments. This content is only available as a PDF. © 1979 AMERICAN GENETIC ASSOCIATION

DOUGLAS, TOMMY, C.;DAWSON, PATTI, E.

doi: 10.1093/oxfordjournals.jhered.a109248pmid: 314952

Abstract The position of the Thy-l (theta cell surface antigen) locus on chromosome 9 of the mouse was determined relative to the biochemical markers Lap-l (leucine arylaminopeptidase) and Mpi-l (mannosephosphate isomerase). Four-point backcrosses using both male and female het erozygotes showed that the order of these loci is Lap-l — Thy-l —Mpi-l. By observing the segregation of alleles at the Mod-i (cytoplasmic malic enzyme) locus, which is known to lie distal to these three markers, it was possible to show that Lap-l is at the centromeric end of this gene group. The overall map for this portion of chromosome 9 as determined by these crosses is: Lap-l —5—Th-l — 7—Mpi-l — 14—Mod-l. This content is only available as a PDF. © 1979 AMERICAN GENETIC ASSOCIATION

WATANABE,, S.;AKITA,, T.;ITAKURA,, C.;GOTO,, M.

doi: 10.1093/oxfordjournals.jhered.a109249pmid: 489954

Abstract Sudden death with severe dyspnea in new-born or infant calves confined to a family of Japanese black cattle was studied. Neither environmental nor bacteriological factors seemed to be involved in the etiology of the disease. Histopathological examination revealed focal degeneration and necrosis of the muscle fibers in the myocardium, to which a diagnosis of idiopathic cardiomyopathy was proposed. The pedigree and mating type analyses suggested that a new autosomal recessive lethal gene was responsible for the syndrome. Rates of incidence of the affected calves in five sire families were tested for an expectation of 12·5 percent incidence by the chi-square method. This content is only available as a PDF. © 1979 AMERICAN GENETIC ASSOCIATION

ROSS, MARY, H.;COCHRAN, DONALD, G.

doi: 10.1093/oxfordjournals.jhered.a109250pmid: N/A

Abstract Cytogenetic and biological properties of a double translocation heterozygote, T(3;7;12), are reported. Chromosome analyses, supported by embryonic lethality data, revealed that three disjunction patterns occur within T(3;7;12) males, i.e., 67·0, 76·7, and 82·6 percent adjacent segregations. Studies of T(3;2) and T(7;2) males provided evidence that factors controlling disjunction in the single heterozygotes are expressed in the double heterozygotes and thus are responsible for the heterogeneity of disjunction. Embryonic lethality data from an early and a later mating series of T(3;7;12) males showed a shift in the relative frequency of the three disjunction types. This is attributed to a change in the T(7;12) parental crossing sys tem. At least a dozen orientations of the ring-of-six in T(3;7;12) males, including several 4-2 types, were noted. The occurrence of meiotic nondisjunction was confirmed by prophase II counts. Comparisons are made between T(3;7;2) and a progressive interchange, T(4;8;10). This content is only available as a PDF. © 1979 AMERICAN GENETIC ASSOCIATION

ANDERSON, MARY, M.;JENKINS, STEPHEN, H.

doi: 10.1093/oxfordjournals.jhered.a109251pmid: 489955

Abstract On the basis of a sample of 156 animals, allele frequencies for the cat population of Reno, Nevada have been estimated. Comparison of this population with populations of 22 other cities shows that Reno's cats are more similar to those of northeastern North America than to those in the southwest. This is consistent with a recent hypothesis that suggests there were two distinct European sources of North American cats, and that present gene pools in North American Cities depend primarily on their history of early settlement. This content is only available as a PDF. © 1979 AMERICAN GENETIC ASSOCIATION

FATOKUN, C., A.;AKEN'OVA, M., E.;CHHEDA, H., R.

doi: 10.1093/oxfordjournals.jhered.a109252pmid: N/A

Abstract The supernumerary inflorescence mutant in okra is described and inheritance studies have shown it to be governed by a single pair of alleles with the mutant being dominant over normal. The symbol Si is proposed for this trait. The potential of this mutant in a breeding program for yield improvement is discussed. This content is only available as a PDF. © 1979 AMERICAN GENETIC ASSOCIATION