Interbreeding
Mostrando 13-23 de 23 artigos, teses e dissertações.
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13. DNA Analysis Indicates That Asian Elephants Are Native to Borneo and Are Therefore a High Priority for Conservation
The origin of Borneo's elephants is controversial. Two competing hypotheses argue that they are either indigenous, tracing back to the Pleistocene, or were introduced, descending from elephants imported in the 16th–18th centuries. Taxonomically, they have either been classified as a unique subspecies or placed under the Indian or Sumatran subspecies. If sh
Public Library of Science.
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14. Where do penguins go during the inter-breeding period? Using geolocation to track the winter dispersion of the macaroni penguin
Although penguins are key marine predators from the Southern Ocean, their migratory behaviour during the inter-nesting period remains widely unknown. Here, we report for the first time, to our knowledge, the winter foraging movements and feeding habits of a penguin species by using geolocation sensors fitted on penguins with a new attachment method. We focus
The Royal Society.
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15. Efficient in vivo manipulation of mouse genomic sequences at the zygote stage.
We describe a transgenic mouse line carrying the cre transgene under the control of the adenovirus EIIa promoter that targets expression of the Cre recombinase to the early mouse embryo. To assess the ability of this recombinase to excise loxP-flanked DNA sequences at early stages of development, we bred EIIa-cre transgenic mice to two different mouse lines
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16. Sexuality and Genetic Identity in the Agaricus Section Arvenses
Twelve wild collections and one commercial strain were used to characterize breeding systems and to develop molecular identities in the Arvenses section of the genus Agaricus, which includes the “horse mushroom” A. arvensis. Two morphotypes were identified based on macro- and micromorphological features. However, not all collections could be delimited by
American Society for Microbiology.
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17. Androgen Regulation of Murine β-Glucuronidase Expression: Identification and Characterization of a Nonresponse Variant
One of the major features of β-glucuronidase (GUS) expression in inbred strains of the house mouse, Mus musculus, is the responsiveness of this enzyme to androgen stimulation in tubule cells of the kidney. Both GUS-specific and nonspecific mutations have been described which define genes that serve to control this response. During examination of the express
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18. Telomerase reverse transcriptase-dependent telomere equilibration mitigates tissue dysfunction in mTert heterozygotes
Autosomal dominant mutations in telomere-associated factors elicit a disease known as dyskeratosis congenita (DKC), and patients suffer proliferative abnormalities associated with telomere erosion. Mice that are heterozygous for telomerase genes (Tert or Terc, hereafter referred to as mTert and mTerc) are useful models of telomerase haploinsufficiency, but d
The Company of Biologists Limited.
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19. Genetics and the origin of bird species
External (environmental) factors affecting the speciation of birds are better known than the internal (genetic) factors. The opposite is true for several groups of invertebrates, Drosophila being the outstanding example. Ideas about the genetics of speciation in general trace back to Dobzhansky who worked with Drosophila. These ideas are an insufficient
The National Academy of Sciences of the USA.
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20. Phylogenetic analysis of “Volvocacae” for comparative genetic studies
Sequence analysis based on multiple isolates representing essentially all genera and species of the classic family Volvocaeae has clarified their phylogenetic relationships. Cloned internal transcribed spacer sequences (ITS-1 and ITS-2, flanking the 5.8S gene of the nuclear ribosomal gene cistrons) were aligned, guided by ITS transcript secondary structural
The National Academy of Sciences.
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21. Molecular characterization of the Akvr-1 restriction gene: a defective endogenous retrovirus-borne gene identical to Fv-4r.
A dominant restriction allele, Akvr-1r, from California wild mice (Mus musculus domesticus) confers resistance to exogenous ecotropic murine leukemia virus (MuLV) infection. The presence of an ecotropic MuLV envelope-related glycoprotein in uninfected virus-resistant cells suggests that viral interference is a possible mechanism for this resistance. We molec
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22. A role for FGF-6 in skeletal muscle regeneration
Fibroblast growth factor-6 (FGF-6) belongs to a family of cytokines that control cell proliferation, cell differentiation, and morphogenetic events. Individual FGFs are either expressed widely or in a restricted pattern during embryonic, fetal, and adult life. FGF-6 exhibits a restricted expression profile predominantly in the myogenic lineage. Important fun
Cold Spring Harbor Laboratory Press.
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23. Deviations from Hardy-Weinberg Frequencies Caused by Assortative Mating in Hybrid Populations
The conventional formulas for genotype frequencies in a hybrid population H produced by interbreeding from ancestral populations P1 and P2 involve only one hybrid parameter M, equal to the fraction of alleles derived from P2. For the one-parameter model to be accurate, all individuals of H must have probabilities for alleles determined by one and the same M.