Results 151 to 160 of about 7,256,161 (195)
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2023
Abstract In this chapter, Darwin emphasizes that characteristics vary greatly among individuals of all species and gives many examples showing that there are often no clear boundaries between species and the varieties within a species. Deciding whether to call something a separate species or merely a variety within a species can be very ...
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Abstract In this chapter, Darwin emphasizes that characteristics vary greatly among individuals of all species and gives many examples showing that there are often no clear boundaries between species and the varieties within a species. Deciding whether to call something a separate species or merely a variety within a species can be very ...
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Natural Variation of Canine Parvovirus
Science, 1985Canine parvovirus was first recognized during 1978. Analysis of isolates collected since its emergence revealed that viruses circulating after 1980 were antigenically different from earlier isolates. Monoclonal antibodies clearly distinguished the two strains, some being specific for either the old or the new viruses.
C R, Parrish +3 more
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Exploiting Natural Variation in Arabidopsis
2013Natural variation for many traits is present within the species Arabidopsis thaliana. This chapter describes the use of natural variation to elucidate genes underlying the regulation of quantitative traits. It deals with the development and use of mapping populations, the detection and handling of genetic markers, the phenotyping of quantitative traits,
Molenaar, J.A., Keurentjes, J.J.B.
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Natural variation in phytochrome signaling
Seminars in Cell & Developmental Biology, 2000The phytochromes, photoreceptors sensitive to red and far-red light, are critical for sensing foliage shade, canopy breaks, and neighbor proximity. A combination of molecular genetic, evolutionary, and ecological techniques are being used to understand how phytochromes function in the natural environment.
Maloof, J. +3 more
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Understanding natural epigenetic variation
New Phytologist, 2010no ...
Richards, C. +2 more
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Morphogenetic origin of natural variation
Biosystems, 2012We studied individual pathways of gastrulation in two related amphibian species making an emphasis on the developmental dynamics of normal variation in the geometry of gastrulation movements. Analyzing the variation dynamics, we show that the linear succession of developmental stages is a secondary phenomenon disguising self-oscillations that lie at ...
Vladimir G. Cherdantsev +1 more
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1906
Variability—Individual differences—Doubtful species—Wide ranging, much diffused, and common species vary most—Species of the larger genera in any country vary more than the species of the smaller genera—Many of the species of the larger genera resemble varieties in being very closely, but unequally, related to each...
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Variability—Individual differences—Doubtful species—Wide ranging, much diffused, and common species vary most—Species of the larger genera in any country vary more than the species of the smaller genera—Many of the species of the larger genera resemble varieties in being very closely, but unequally, related to each...
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Natural Variation in Arabidopsis thaliana
2010Arabidopsis thaliana is a wild species widely distributed in diverse environments and current resources allow efficient quantitative analyses aimed to identify the genetic and molecular bases of adaptation. The study of natural genetic variation in this model plant has rapidly developed in the past 10 years, leading to the identification of hundreds of
Koornneef, M. +2 more
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Natural variation in learning and memory
Current Opinion in Neurobiology, 2013Learning is widespread in the animal kingdom. From the small nematode worm Caenorhabditis elegans to humans, learning appears to play a central role in adaptation to local spatial and temporal environmental conditions. Though the neurobiological mechanisms of learning and memory have been intensively studied, the function and adaptive significance of ...
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Varieties of behavioral natural variation
Current Opinion in Neurobiology, 2013Behavior is flexible at different timescales, modifiable by experience in the short term and by evolution in the long term. In order to understand how behavior evolves, we must both understand how trait differences between individuals are inherited and how a subset of these differences get fixed within a species' lineage. Work over the past few decades
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