Evolution De tidigaste organismerna var encelliga och levde för tre och en halv miljarder år sedan. Alla organismer har genomgått en evolution och skillnaderna mellan dem beror på gradvisa anpassningar till olika livsmiljöer. Evolutionära förändringar har oftast lett till mer komplexa former men ibland har organismer förenklats, till exempel parasiter. Med evolutionsteorin kunde Charles Darwin förklara hur olika arter av växter och djur har förändrats och utvecklats sedan livet började på jorden. Av allt liv som funnits har 99,9% dött ut. Fem frågor om evolution 1. Nej. Individer ”strävar” inte medvetet att bli perfekt anpassade till sin miljö. 2. Nej, den gynnar de egenskaper som leder till flest avkommor. liten - om miljön är trångsnabb - för att komma undan rovdjurklara hög temperatur - om man lever i tropikerna Det avgörande är samspelet mellan egenskaperna och miljön och om det leder till stor eller liten fortplantning. 3. Nej, naturligt urval styr evolution tillsammans med slump. 5.
The PCR Method - a DNA Copying Machine Lists of Nobel Prizes and Laureates The PCR Method - a DNA Copying Machine Play the Eye of the Donkey Game About the game PCR is a method by which a few fragments of DNA can be duplicated into millions in a couple of hours. The Nobel Prize The 1993 Nobel Prize in Chemistry was awarded for the invention of PCR, a method that made it possible to copy a large numbers of DNA fragments in only a few hours. Share this: Share on facebook Share on google_plusone_share Share on twitter More Sharing Services Share on email To cite this pageMLA style: "The PCR Method - a DNA Copying Machine". Recommended: The Legacy of Alfred Nobel On 27 November 1895 Alfred Nobel signed his last will in Paris. Play the Blood Typing Game Try to save some patients and learn about human blood types! Unlocking the Secrets of Our Cells Discover the 2012 awarded research on stem cells and cell signalling. Contact E-mail us Press Sitemap A-Z Index Frequently Asked Questions Terms Follow Contact | Press | Sitemap | FAQ | Terms Follow us:
DNA from the Beginning - An animated primer of 75 experiments that made modern genetics. evolution Proto Magazine Cell Models For life all cells have basic needs. Cells have diverged in their structure and function to accommodate these survival requirements. Here are some KEY TERMS to help you think, explore and search for similarities and significant differences that have become the characteristics of eukaryote (animal, plant) and prokaryotic (bacteria) cells. Examples might be searching: eukaryote prokaryote reproduction or animal plant cell energy. Reproduction / cell division Energy trapping, storage and consumption Form / shape / structure Cell specialization Compartmentalization of cell functions Communication within and beyond the cell Cell / organism survival
The Evolution & Medicine Review Charles Darwin | Allt om Historia Under en världsomsegling insåg Charles Darwin hur livet på jorden hade utvecklats. Hans teori om evolutionen var lika enkel som genial, men kastade samtidigt Bibelns skapelseberättelse över ända och mötte hårt motstånd. Text: Anna Larsdotter I augusti 1831 fick Charles Darwin ett brev som skulle förändra hans liv. I brevet frågade Henslow om Darwin ville följa med på en forskningsseglats runt jorden. Så gav sig Charles Robert Darwin den 27 december 1831 av på sitt livs resa. Darwin växte upp med en äldre bror och fyra systrar. Charles Darwin var inte av riktigt samma skrot och korn som sin far och farfar. Han hade lärt sig att stoppa upp djur och byggt upp en imponerande samling skalbaggar. Darwin fascinerades av de arter han hittade på ögruppen. Darwins anteckningar från resan med Beagle var fyllda av entusiastiska utrop. Detta var inte sant, insåg Darwin. Men Charles Darwin var inte en man som förhastade sig. Nu blev det bråttom. Charles Darwin förblev en arbetsmyra in det sista.
One Health Commission Charles Darwin Home - Zoobiquity Hunt for alien spacecraft begins, as planet-spotting scientist Geoff Marcy gets funding Artist rendering of alien spaceship Photo: Ray Edgar In the field of planet hunting, Geoff Marcy is a star. After all, the astronomer at the University of California at Berkeley found nearly three-quarters of the first 100 planets discovered outside our solar system. But with the hobbled planet-hunting Kepler telescope having just about reached the end of its useful life and reams of data from the mission still left uninvestigated, Marcy began looking in June for more than just new planets. He's sifting through the data to find alien spacecraft passing in front of distant stars. He's not kidding - and now he has the funding to do it. If intelligent life is common in the galaxy, "where is everybody?" Last fall, the Templeton Foundation, a philanthropic organisation dedicated to investigating what it calls the "big questions" - which, unsurprisingly, include "Are we alone?" What astronomer Geoff Marcy doesn't hope to find: A Death Star Photo: Wookieepedia Advertisement Successful so far
Space colonization Space colonization (also called space settlement, or extraterrestrial colonization) is permanent human habitation that is not on Earth. Many arguments have been made for space colonization. The two most common ones are survival of human civilization and the biosphere from possible disasters (natural or man-made), and the huge resources in space for expansion of human society. However right now the challenges, both technological and economic, involved in building a space colony are as great as the potential payoff. Space settlements would have to provide for all the material needs of hundreds or thousands of humans in an environment out in space that is very hostile to human life. There have been no space colonies built so far, nor are there any governments or large-scale private organizations with a timetable for building any. Reasons[edit] Survival of human civilization[edit] J. Survival of the biosphere[edit] Vast resources in space[edit] Expansion with fewer negative consequences[edit]