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... is the fact that the present blueprint covers only 2-3 % of the territory. That's right, 97-98% of the human genome isn't mapped at all. This uncharted territory is assumed to be "junk" or "nonsense" DNA that plays no role in heredity. Want to bet that this assumption is correct? And don't forget that genes jump around. The genome is really a moving target. Genes also work in concert. It is not one gene coding for one protein, which then has a singular role in creating an operational human being. For example, some 5,692 genes are active in breast-cancer cells. Genes may also have multiple roles. Our present blueprint of the human genome does not display all the ... Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Oh, The Complexity of it All!The headlines say that the human genome has been charted and further imply that we now can read life's total blueprint. Closer study of the announcement reveals that there still remain unreadable snippets of the genome here and there. In fact, the total number of human genes is still in doubt: maybe 30,000, some say 120,000. This wide range of uncertainty does not inspire belief in the accurate readability of this biological blueprint at the present time. Usually left unsaid is the fact that the present blueprint covers only 2-3 % of the territory. That's right, 97-98% of the human genome isn't ...
Terms matched: 2 - Score: 238 - 15 May 2017 - URL: /sf131/sf131p07.htm
... Science Frontiers ONLINE No. 23: Sep-Oct 1982 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Short-circuiting heredity Genes, those carriers of heredity, have turned out to be great gadabouts. Not only do they jump about within a species, but also between species, especially the simple prokaryotic organisms, such as bacteria. It is now well accepted that genes flow between different species of bacteria in physical contact, thus stirring the evolutionary pot. Until recently, scientists believed that the higher organisms, the eukaryotic species, including you and me, did not indulge in such "horizontal" traffic between species. But a few cases have now been found, one involving humans and a microorganism associated with tumors. And the search is ... Science Frontiers ONLINE No. 23: Sep-Oct 1982 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Short-circuiting heredity Genes, those carriers of heredity, have turned out to be great gadabouts. Not only do they jump about within a species, but also between species, especially the simple prokaryotic organisms, such as bacteria. It is now well accepted that genes flow between different species of bacteria in physical contact, thus stirring the evolutionary pot. Until recently, scientists believed that the higher organisms, the eukaryotic species, including you and me, did not indulge in such "horizontal" traffic between species. But a few cases have now been found, one involving humans and a microorganism associated with tumors. And the search is ...
Terms matched: 2 - Score: 214 - 15 May 2017 - URL: /sf023/sf023p06.htm
... some 500 million years ago. Two curious facts have cropped up, however. First, about 200 million years ago, these genes were modified very slightly and relocated to entirely different chromosomes. Second, 95% of the DNA associated with these genes is "junk" -- with no known use. Why did nature conserve junk for 500 million years? Are vital genes in the habit of jumping from one chromosome to another? (Yanchinski, Stephanie; "DNA: Ignorant, Selfish and Junk," New Scientist, 91:154, 1981.) From Science Frontiers #17, Fall 1981 . 1981-2000 William R. Corliss ...
Terms matched: 2 - Score: 204 - 15 May 2017 - URL: /sf017/sf017p06.htm
... favor extreme environments and, curiously, are more closely related to you and me than are the bacteria. But according to this article (by W.F . Doolittle), the triple-trunked Tree of Life is simplistic. One reason for this is that genes, once thought to flow only from parent to progeny, are now known to travel laterally. Species barriers are broken. Genes jump from trunk to trunk, from branch to branch, twig to twig. Of course, these jumps are seen primarily among the microorganisms. The real Tree of Life, then, is more like a snarl of vines--a Jungle of Life, a genetic Tower of Babel! Furthermore, no longer does the multiplicity of life forms spring from a single primordial cell but rather from a ... ." The article proper relates how the Tree of Life has its own evolutionary history. Twenty years ago, scientists had that single ancestral cell splitting into two main trunks: the prokaryotes (bacteria) and the eukaryotes (every-thing else). More recently, a third trunk has been grafted onto the Tree; namely, the archaea (microorganisms that look like bacteria but possess markedly different genes). The archaea favor extreme environments and, curiously, are more closely related to you and me than are the bacteria. But according to this article (by W.F . Doolittle), the triple-trunked Tree of Life is simplistic. One reason for this is that genes, once thought to flow only from parent to progeny, are now known to travel laterally. Species ...
Terms matched: 2 - Score: 196 - 15 May 2017 - URL: /sf128/sf128p05.htm
... pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Directed Mutation Dear reader, things have a way of working out serially. For several months, we have had in our possession a paper from Nature, by J. Cairns, of Harvard, plus some passionate correspondence stimulated by the paper. Now that the circle-forming sheep have provided a good introduction, we will jump into the fray, too. Basically Cairns (in Nature) and B. H. Hall (in Genetics ) say that organisms can respond to environmental stresses by reorganizing their genes in a purposeful way. Such "directed mutation" shifts the course of evolution in a nonrandom way. Such a conclusion was like waving a red flag in front of the evolutionists. R. May, at ... University of Oxford, complained, "The work is so flawed, I am reluctant to comment." On the other side, a University of Maryland geneticust, S. Benson, comments, "Many people have had such observations, but they have problems getting them published." Our template in this discussion is an article by A.S . Moffat in American Scientist. She says, "The stakes in this dispute are high, indeed. If directed mutations are real, the explanations of evolutionary biology that depend on random events must be thrown out. This would have broad implications. For example, directed mutation would shatter the belief that organisms are related to some ancestor if they share traits. Instead, they may simply share exposure to the same environmental cues. Also, different ...
Terms matched: 2 - Score: 176 - 15 May 2017 - URL: /sf064/sf064b07.htm
... Prey Digested? Live-Bearing Lizards Warm-Blooded Leatherbacks Reptiles Never Stop Growing Giant Tadpoles That Become Tiny Frogs! Metamorphosis Enigmas Newt-Eye Regeneration Frogs without Tadpole Stage Live Birth in Frogs Infertile Eggs Laid for Food BRG GENETICS Green Turtle Populations Have Very Small Genetic Differences Homeobox-Gene Control of Body Plans Strong Convergence in Island Lizards [BRD] Chromosome-Number Effect upon Amphibian Development Frog Genes Jump between Species "Cryptic Species": Look Alike But Genetically Different Marked DNA Differences within Same Species BRI INTERNAL SYSTEMS AND STRUCTURES Low Antibody Diversity in Reptiles and Amphibians Magnetite Concentrations BRO ORGANS Lungs Used for Hearing Independent Eye Motion Lungless Salamanders Amphibian Lateral Lines Reptile Third Eyes [BRA] Eyes with Mirror Optics Rectal and Throat Gills in Turtles Blind Amphibians Snake Eyes Focus Like Fish Eyes (Except in the ... Cycles in Autistic Births Rhythms in Growth Evolution of Lactose Tolerance Twins and Occurrence of Nightmares Timing of the End of Sleep BHG HUMAN GENETICS BHG1 Human Chromosomes Less Evolved Than Ape Chromosomes BHG2 The Presence of Introns in Human Chromosomes BHG3 Human Chromosomes Lack the "Baboon Marker" BHG4 Y-Chromosome Analysis Suggests First Humans Were Pygmies BHG5 Human and Ape Chromosome Numbers Differ BHG6 Identical Twins May Have Different Genomes BHG7 Gene Imprinting: Parental Influence on Genes BHG8 The Accentuation of Inherited Traits in Succeeding Generations BHG9 Higher Variability of Mitochondrial DNA in Subsaharan Africans BHG10 Mitochondrial DNA Evolves Much Faster Than Nuclear DNA BHG11 Disparity between Human and Ape Phenotypes and Genotypes BHG12 Chimpanzee Mitochondrial DNA More Diverse Than That of Humans BHG13 Human Mitochondria Radically Different from Those of Other Organisms BHG14 Paternal Mitochondrial DNA can Be Inherited BHG15 African Nuclear DNA Is ...
Terms matched: 2 - Score: 164 - 15 May 2017 - URL: /cat-biol.htm
... Science Frontiers ONLINE No. 47: Sep-Oct 1986 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology Explaining the Nazca Lines Humans in the Americas 32,000 Years Ago? Astronomy Lumps, Clumps, and Jumps Clump of Antimatter 1986: "Tired Light" Revived Again Biology Something Big Down There! Brain Architecture: Beyond Genes Heretical Evolutionary Theory The Chromosome Gap How the Cheetah Lost its Stotts Earth's Womb Geology Oil & Gas From the Earth's Core Oceans From Outer Space? Continental Graveyard? Two Points of Great Impact Geophysics A True Fish Story Booming Dunes Another Luminous Aerial Bubble Psychology Magnetic Theory of Dowsing Chemistry & Physics Unpredictable Things ...
Terms matched: 2 - Score: 163 - 15 May 2017 - URL: /sf047/index.htm
... #38) is probably solvable in terms of clouds of water molecules surrounding crystal nuclei with electrostatic fields guiding the symmetric deposition of molecules. Biological structures, too, are probably encompassed by clouds of atoms and molecules; viz., the crystal-like, polyhedral viruses. Does the highly ordered DNA structure also possess an aura of molecules constantly swapping places ? Such would not be inconsistent with "jumping genes" and M. Kimura's Neutral Theory of Evolution (SF#41). (WRC) From Science Frontiers #42, NOV-DEC 1985 . 1985-2000 William R. Corliss ...
Terms matched: 2 - Score: 142 - 15 May 2017 - URL: /sf042/sf042p26.htm
... do well in counting the large mammals and birds, but most insects and microscopic forms of life have escaped description. To illustrate, in 1964, the British ecologist C.B . Williams, combining intensive local sampling and mathematical extrapolation, extimated the insect population as 3 million species. However, by 1985, this figure has been raised ten-fold to 30 million species. Why the huge jump? For the first time, entomologists had found a way to efficiently sample the canopies of tropical forests. This rich stratum between the sunlight and gloomy forest floor 100+ feet below had been largely neglected before. The slick tree trunks and the attacking swarms of wasps and stinging ants deterred the insect counters. What the collectors did was to fire projectiles with ropes over the high branches and then ... Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Biological Diversity Crisis If life fills all available energy niches, life must be capable of transforming itself (or of being transformed) into a multitude of different energy transducers or energy utilizers. E.O . Wilson has outlined the diversity of terrestrial life in a recent issue of BioScience. The earth, it appears, is a veritable Gene sis Machine; and it is only one planet among a possible infinitude. So many terrestrial species have already been described that one could easily believe that biological collectors roaming the planet's wild places have just about completed their task. Some recent totals: 47,000 species of vertebrates, 440,000 plants, and 751,000 insects. But we may not even be close to ...
Terms matched: 2 - Score: 140 - 15 May 2017 - URL: /sf043/sf043p10.htm
