A Possible Back-Cross Hybrid Involving Scaled and Gambel's Quail

The Auk ◽  
1966 ◽  
Vol 83 (1) ◽  
pp. 136-137 ◽  
Author(s):  
John P. Hubbard
Keyword(s):  
Back Cross ◽  
Gambel's Quail

Eyeworm infections ofOxyspirura petrowi, Skrjabin, 1929 (Spirurida: Thelaziidae), in species of quail from Texas, New Mexico and Arizona, USA

2016 ◽  
Vol 91 (4) ◽  
pp. 491-496 ◽  
Author(s):  
N.R. Dunham ◽  
R.J. Kendall
Keyword(s):  
New Mexico ◽  
Population Decline ◽  
Northern Bobwhite ◽  
Cellular Damage ◽  
Scaled Quail ◽  
Callipepla Squamata ◽  
The Past ◽  
New Research ◽  
Gambel's Quail ◽  
Historical Range

AbstractNorthern bobwhite (Colinus virginianus) and Scaled quail (Callipepla squamata) have been declining steadily throughout much of their historical range over the past few decades. Even the Rolling Plains of Texas, historically rich with wild quail and one of the last remaining quail strongholds, has been suffering a population decline, most notably since 2010. Gambel's quail (Callipepla gambelii) have also been experiencing their own decline throughout their respective range, but not as significant as that of other species of quail. Eyeworms (Oxyspirura petrowi) in quail have been recognized for years but not thoroughly studied until recently. New research reveals thatO. petrowiinfection can cause inflammation, oedema, and cellular damage to the eye of the quail host. The objective of this research was to better understand the prevalence of the eyeworm infection in different quail species, expand on known distribution, and determine if there is a relationship between location and species infected with eyeworms. Northern bobwhite, Scaled quail and Gambel's quail were hunter-donated from one county within Texas, New Mexico and Arizona, and examined for the prevalence, mean abundance and mean intensity of eyeworm infection from November 2013 to February 2014. Quail from every location were found to have individuals with a varying degree of eyeworm infection. This is the first study to document eyeworm infection in Gambel's quail and in quail in New Mexico and Arizona, and reports the highest eyeworm infection found in Northern bobwhite and Scaled quail.

II.—Hidden Divergence in Laboratory Strains of Drosophila pseudo-obscura

1944 ◽  
Vol 62 (1) ◽  
pp. 9-19 ◽  
Author(s):  
Rowena Lamy
Keyword(s):  
Body Size ◽  
Sex Ratio ◽  
Genetic Constitution ◽  
Low Grade ◽  
Testis Size ◽  
Hybrid Female ◽  
Back Cross ◽  
Pure Race ◽  
Range Of Variation

The Race A/Race B hybrid females of D. pseudo-obscura have a high percentage of fertility, comparable with that of females of pure race. The number and viability of their offspring, however, are largely affected by the genetic constitution of the hybrid female as well as by that of the male to which she is mated in the backcross. Hence the performance of any given hybrid is determined in the first instance by the actual strains of the pure races which are used in making the P1 racial cross. Generally speaking the results are of the same order whenever the same strains are used. The progenies of hybrid females of different genetic constitution may differ in three main aspects: (1) The total number of offspring may be comparable with that usually obtained in a pure race cross; it may be reduced to any extent; in certain matings it is consistently at zero. (2) The sex ratio may be completely normal or male-deficient or female-deficient in any degree; completely uni-sexual progenies are sometimes obtained. (The above observations are mainly in agreement with reports of earlier writers; cf. Lancefield, 1929, Dobzhansky, 1936, Mampell, 1941, Sturtevant, 1937.) (3) “Viability characters,” i.e. those affecting general vigour and physical normality, may be of a high or a low grade; some progenies are comparable in this respect with the pure race, the only exception being that they show a much greater range of variation in body-size of both sexes, and in the testis size of males, abnormalities which are common to all back-cross progenies whatever the genetic constitution of the mother or father. Some progenies show in addition deformities of a peculiar type usually affecting the abdomen and occasionally the legs and wings.

Phylogeography of the Gambel's Quail (Callipepla gambelii) of western North America

2014 ◽  
Vol 126 (2) ◽  
pp. 218 ◽  
Author(s):  
Damon Williford ◽  
Randy W. DeYoung ◽  
Rodney L. Honeycutt ◽  
Leonard A. Brennan ◽  
Fidel Hernández ◽  
...  
Keyword(s):  
North America ◽  
Western North America ◽  
Gambel's Quail

scholarly journals Penampilan Fenotipik Populasi Dasar Jagung Pulut Lokal Sulawesi Selatan dengan Seleksi Back Cross

2019 ◽  
Vol 19 (2) ◽  
Author(s):  
Junyah Leli Isnaini
Keyword(s):  
Plant Height ◽  
Total Sample ◽  
Back Cross ◽  
South Sulawesi ◽  
Plant Samples ◽  
Female Flowering ◽  
Waxy Corn ◽  
Cross Test

This research aims to see the phenotypic appearance of selected families from the basic population of  local waxy corn of South Sulawesi which is back cross with the parents. The technique of crosses used is repeated selection that is to make a cross between selected families (recombination) by means of free crossing. The number of cross-test of 5 selected families and 5 varieties of comparison (parents) with 2 replications. Each replica was planted with 10 lines of  20 lines of with 20 cm x 50 cm spacing), the total number of plants in this research were 400 plants. Each line represented 5 sample plants, so the total sample of 200 plants. The results showed that from 5 selected families who crossed with their parents as a whole can improve the phenotype character. The selected local waxy corn has a superior appearance of the phenotype character. Of the 200 plant samples, there are 75 plants that have superior appearance (better phenotype appearance than their parents) on the character : plant height , the height of cob location, male flowering, female flowering, and  husk cover.

scholarly journals Selection and Inheritance of Tomato Resistance against Ralstonia solanacearum

2019 ◽  
Vol 23 (1) ◽  
pp. 61
Author(s):  
Isna Maulida ◽  
Rudi Hari Murti ◽  
Triwidodo Arwiyanto
Keyword(s):  
Bacterial Wilt ◽  
Ralstonia Solanacearum ◽  
Dominant Gene ◽  
Tomato Plants ◽  
Breeding Lines ◽  
Back Cross ◽  
Inheritance Patterns ◽  
Randomized Design ◽  
Resistant Varieties ◽  
Resistant Lines

Ralstonia solanacearum is a plant pathogen causes wilting which is a major obstacle in the cultivation of tomato plants. In plant breeding, knowledge of the source of resistance genes and inheritance patterns is important in the development of bacterial wilt resistant varieties. This study aimed to obtain bacterial wilt resistant lines and to find out the inheritance pattern of tomato resistance to bacterial wilt. Selection of resistant plant involved the selected breeding lines from irradiation and crossing collections of the Genetic Laboratory, Faculty of Agriculture, Universitas Gadjah Mada. Introduced lines of H-7996 and F1 Permata and Timoti were used as a control. H-7996 as resistant parents and GM2 as susceptible parents, and their offspring include F1 GM2 x H-7996, F1 reciprocal, F2, Back Cross 1 (F1 x GM2), and Back Cross 2 (F1 x H-7996) used in testing inheritance patterns. Inoculation was carried out 1 week after planting by pouring 100 ml of water suspension of R. solanacarum (108  cfu/ml) on the roots. Completely Randomized Design (CRD) was used in this experiment. The scoring observation was carried out every week for one month. This study showed that Permata as a control was the most resistant, while Timoti and H-7996 were medium resistant. The CLN, G6, G8, and G7 lines were susceptible medium, yet only G8 and G7 with the smallest percentage of disease intensity and not significantly different than Timoti. The resistance gene to bacterial wilt on H-7996 was controlled by genes in the cell nucleus with additive-dominant gene action. Resistance to bacteria has a moderate level of heritability.

Dieldrin-resistance in a strain of Aedes aegypti (L.) from Puerto Rico

1964 ◽  
Vol 55 (3) ◽  
pp. 519-526 ◽  
Author(s):  
A. M. Guneidy
Keyword(s):  
Puerto Rico ◽  
Aedes Aegypti ◽  
Cross Resistance ◽  
Autosomal Gene ◽  
Normal Strain ◽  
Susceptible Parent ◽  
Resistant Parent ◽  
Back Cross ◽  
Direct Cross ◽  
Resistance Spectrum

The cross-resistance characteristics of a dieldrin-resistant strain of Aedes aegypti (L.) from Puerto Rico were investigated by comparative tests on the adults of this and of a normal strain, using various insecticides. A resistance spectrum typical of that associated with resistance to BHC/dieldrin in other insects was revealed, characterised by slight or negligible cross-resistance to DDT, malathion and diazinon.The mode of inheritance of dieldrin-resistance was studied by determining resistance levels in the progeny of direct crosses of the resistant and normal strains and of back-crosses. The F1 generation of the direct cross was of intermediate resistance, and the F1 generation showed 1:2:1 segregation into normal, intermediate and resistant individuals. Both back-crosses showed 1:1 segregation into susceptible and intermediate individuals when the back-cross was to the susceptible parent, or into intermediate and resistant individuals when it was to the resistant parent, and these results were confirmed when one genotype was eliminated and the back-cross was repeated. These results indicate monofactorial inheritance of an autosomal gene with intermediate dominance, which is typical of the BHC/dieldrin type of resistance.

scholarly journals Conversion of partial restorer Swarna into restorer by transferring fertility restorer Rf gene(s) through marker assisted back cross breeding (MABB) in rice

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Revathi Ponnuswamy ◽  
Arun Kumar Singh ◽  
Meenakshi Sundaram Raman ◽  
Lella venkata Subbarao ◽  
Neeraja C.N.
Keyword(s):  
Fertility Restorer ◽  
Back Cross ◽  
Cross Breeding ◽  
Rf Gene

scholarly journals TOLERANCE AND IMMUNITY TO MATERNALLY DERIVED INCOMPATIBLE IgG2a-GLOBULIN IN MICE

1970 ◽  
Vol 132 (3) ◽  
pp. 440-447 ◽  
Author(s):  
Noel L. Warner ◽  
Leonore A. Herzenberg
Keyword(s):  
Immunological Tolerance ◽  
The State ◽  
Immunologic Tolerance ◽  
Back Cross ◽  
Experimental Induction ◽  
Foreign Proteins ◽  
Series Of Experiments ◽  
Natural Situation ◽  
Induction Of Tolerance

Progeny mice were confronted with maternal γ-globulin of a different allotype by either back-cross mating, intercross mating, or by foster nursing. In all cases, many mice subsequently produced alloantibodies directed against the incompatible maternal type of IgG2a-globulin. In one series of experiments, immunologic tolerance to the maternally derived γ-globulin was demonstrated to exist in the period before formation of spontaneous antibody. The state of tolerance was then lost, unless maintenance injections of foreign γ-globulin were given. These studies demonstrate in a natural situation that maternally derived foreign proteins can first induce a state of immunological tolerance which is followed, after disappearance of the antigen, by a state of immunity. As such, this parallels the experimental induction of tolerance to foreign proteins by neonatal injections.

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