Results 241 to 250 of about 19,447 (279)
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Cytogenetics and Cell Genetics, 2008
The distribution of constitutive heterochromatin and nucleolus organizer regions (NORs) in somatic as well as in meiotic chromosomes of Bos taurus, Bos banteng, Bison bison, and their hybrids are analyzed. C-bands are present in the centromeric regions of every autosome.
S. Pathak, N.M. Kieffer
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The distribution of constitutive heterochromatin and nucleolus organizer regions (NORs) in somatic as well as in meiotic chromosomes of Bos taurus, Bos banteng, Bison bison, and their hybrids are analyzed. C-bands are present in the centromeric regions of every autosome.
S. Pathak, N.M. Kieffer
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2013
The review summarizes hybrid sterility as the best studied example of reproductive isolation between closely related species. On the model of infertile hybrids of two domestic mouse subspecies, Mus musculus musculus and Mus musculus domesticus, we have demonstrated interaction of hybrid sterility genes with epigenetic control of transcriptional ...
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The review summarizes hybrid sterility as the best studied example of reproductive isolation between closely related species. On the model of infertile hybrids of two domestic mouse subspecies, Mus musculus musculus and Mus musculus domesticus, we have demonstrated interaction of hybrid sterility genes with epigenetic control of transcriptional ...
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On sterile and hybrid pheasants
Journal of Genetics, 19131. Evidence is brought forward to show that the sterility of the male and female hybrid pheasants is due to abnormalities occurring at the synapsis stage of the reduction division. 2. The spermatozoa of the hybrids are either deformed, with chromatic beads and thickenings on them, or else of abnormal size, double-sized spermatozoa being ...
Geoffrey Smith, Haig Thomas
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Selection for the Inviability of Sterile Hybrids
Journal of Heredity, 1988Complementary lethal, semilethal, and dwarfing genes whose effects appear to be expressed only in (usually sterile) interspecific hybrids are not uncommon in plants. Accounting for these genes by Darwinian selection has been somewhat puzzling. However, if luxuriant, sterile hybrid progeny compete with and tend to eliminate their pure-species half-sibs,
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Hybrid sterility in meadowlarks
Nature, 1979THE eastern meadowlark (Sturnella magna) and western meadowlark (S. neglecta) are sibling species of songbirds in secondary contact throughout a narrow zone of sympatry in central North America1–3. Field studies suggest that specific differences in vocalisations are the principal isolating mechanism and that hybridisation is limited in extent and ...
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Male Sterilities and F1 Hybrids in Brassica
1992Many Brassica species are economically important as vegetables (B. oleracea, B. campestris, B. juncea), condiments (B. nigra, B. juncea), forages (B. oleracea, B. campestris, B. napus) and as sources of edible or industrial oil and meal (B. campestris, B. napus, B. juncea, B. carinata).
Renard, M. +9 more
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Nature, 1938
IT is a remarkable fact that the disturbances connected with genic sterility in hybrids between species (or races) are paralleled within species by similar disturbances caused by single genes. For example, there is an analogy between the asynaptic mutations in several plants and genic asynapsis in hybrids and likewise between the polymitotic mutation ...
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IT is a remarkable fact that the disturbances connected with genic sterility in hybrids between species (or races) are paralleled within species by similar disturbances caused by single genes. For example, there is an analogy between the asynaptic mutations in several plants and genic asynapsis in hybrids and likewise between the polymitotic mutation ...
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Malformations of Vertebrae in Sterile Hybrid Ducklings
Avian Diseases, 19685. Hudson, C. B., and F. R. Beaudette. Infection of the cloaca with the virus of infectious bronchitis. Science 76:34, 1932B. 6. Kernohan, G. Infectious bronchitis in fowls. Calif. Agr. Expt. Sta. Bull. 494, 1930. 7. Kernohan, G. Infectious laryngotracheitis in pheasants. J. Am. Vet. Med. Assoc. 78:553, 1931A. 8. Kernohan, G.
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The Inviability, Weakness, and Sterility of Interspecific Hybrids
1958Publisher Summary In this chapter, the review of available data clearly points to the conclusion that the causes underlying the erection of barriers of reproductive isolation, therefore of the origin of species, differ considerably from one group of organisms to another.
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The genetic basis of sterility in someDrosophila hybrids
Journal of Genetics, 1948The sterility of certainDrosophila pseudo-obscura/persimilis hybrid females is shown to be directly correlated with the genotype as a whole of thepseudo-obscura parent. Progressive alteration of the genotype by outcrossing resulted in increased fertility of the hybrids.
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