1 / 20

Ontogeny Recapitulates Phylogeny

Ontogeny Recapitulates Phylogeny. How We Classify and Why!. ONTOGENY. DEVELOMENT. VARIATION, CHANGE, SELECTION, SURVIVAL AND REPRODUCTION. WHAT IS A SPECIES?

yeo-clayton
Download Presentation

Ontogeny Recapitulates Phylogeny

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Ontogeny Recapitulates Phylogeny How We Classify and Why!

  2. ONTOGENY • DEVELOMENT

  3. VARIATION, CHANGE, SELECTION,SURVIVAL AND REPRODUCTION • WHAT IS A SPECIES? • A SPECIES IS A GROUP OF ORGANISMS THAT BREED TOGETHER UNDER NATURAL CONDITIONS AND HAVE VIABLE OFFSPRING. THEY ARE ISOLATED IN SOME WAY FROM OTHER SUCH GROUPS.

  4. DIFFERENT SPECIES

  5. THERE IS NO SUCH CATEGORY CALLED SPECIE. THE WORD SPECIES IS USED IN A SINGULAR FASHION, AS WELL AS FOR MORE THAN ONE. – ONE SPECIES, TWO SPECIES, ETC.

  6. ALL MEMBERS OF A SPECIES FORM A POPULATION. A POPULATION IS A GROUP OF ORGANISMS REPRESENTED BY A SINGLE SPECIES.

  7. POPULATION

  8. POPULATIONS OF DIFFERENT ORGANISMS MAKE UP A COMMUNITY.

  9. COMMUNITY

  10. ORGANISMS IN NATURE HAVE A TOUGH LIFE • THEY MUST FACE ENVIRONMENTAL CHANGES • THEY MUST CONTEND WITH PREDATION AND PARASITISM • THEY MUST UNDERGO CHANGE - THROUGH MUTATIONS • THROUGH ALL OF THIS, THEY MUST STRIVE TO SURVIVE AND REPRODUCE

  11. YES, IT’S TRUE. THERE IS NO ONE EXACTLY LIKE YOU. YOU ARE AN INDIVIDUAL THAT IS UNLIKE ANY OTHER INDIVIDUAL. • Dr. H.R.Hermann

  12. SOME TYPES OF VARIATION • ANATOMICAL • PHYSIOLOGICAL • BEHAVIORAL

  13. CHANGES ARE CONSTANTLY OCCURING IN THE PHYSICAL WORLD • GLOBAL WARMING – OVER LONG PERIODS OF TIME, CHANGES SEA LEVEL AS WELL AS CLIMATES • GLOBAL COOLING • CONTINENTAL DRIFT – SEPARATES SOME GROUPS OF ORGANISMS AND BRINGS OTHERS TOGETHER • CHANGING WIND CURRENTS • CHANGING OCEAN CURRENTS • CHANGING CLIMATE – ALTERS COMMUNITIES • POLAR SHIFTS • VOLCANIC ACTIVITY – DESTROYS ENVIRONMENTS • EARTHQUAKES – QUICKLY CHANGES AN ENVIRONMENT • MOUNTAIN FORMATION – PROGRESSIVE, LONG-TERM CHANGES THAT OFTEN RESULT FROM CONTINENTAL DRIFT • EROSION – NEW CHEMICALS ARE ADDED TO THE ENVIRONMENT • RAINFALL – PROVIDES WATER, FACILITATES LIFE, FACILITATES DECOMPOSITION, CHANGES ENVIRONMENTS – HYDROGEN BONDING BETWEEN WATER MOLECULES OFFERS CERTAIN FEATURES THAT ARE USED BY ORGANISMS, E.G., SPIDERS, INSECTS, LIZARDS, ETC. • RIVERS, LAKES, PONDS, LAKES FORM AND DISAPPEAR

  14. ENVIRONMENTAL CHANGES

  15. THESE CHANGES IN OUR EARTH PUT PRESSURES ON POPULATIONS OF ORGANISMS, SUBJECTING THEM TO STRESSES THAT WILL MAKE POPULATIONS CHANGE.

  16. ALONG WITH THESE CONSTANT CHANGES, VARIATION WITHIN ALL POPULATIONS TENDS TO CHANGE THE POPULATIONS OVER TIME. FEATURES POSSESSED BY CERTAIN INDIVIDUALS WITHIN A POPULATION MAY HELP THEM SURVIVE BETTER THAN OTHERS. THOSE INDIVIDUALS THAT ARE BEST SUITED TO THE CURRENT CONDITIONS ARE THE ONES TO SURVIVE AND REPRODUCE.

  17. THIS IS WHAT NATURAL SELECTION IS ALL ABOUT – THE POSSESSION OF CERTAIN TRAITS THAT HELP AN INDIVIDUAL SURVIVE AND PASS ON ITS GENES TO SUCCEEDING GENERATIONS.

  18. SUMMARY OF SOME IMPORTANT FEATURES IN POPULATIONS • VARIATION – ALL POPULATIONS SHOW VARIATION • CHANGE – CHANGES ARE CONSTANTLY OCCURING. NOTHING IS STATIC. • SELECTION OF INDIVIDUALS THAT BEST SUIT THE ENVIRONMENT – NATURAL SELECTION – BIOLOGISTS SPEAK OF MAXIMIZATION.

  19. HISTORY OF PHILOSOPHY • BEFORE THE 1700S, BOTH SCIENCE AND PHILOSOPHY WERE INFLUENCED BY RELIGIOUS BELIEFS. • DURING THE 1500S, PHILOSOPHERS BEGAN TO THINK ON THEIR OWN AND BEGAN TO LOOK CRITICALLY AT THE NATURAL WORLD. • IT WASN’T UNTIL THE 1800S THAT SCIENCE BEGAN TO TAKE OFF AND MAKE IMPORTANT BREAK-THROUGH DISCOVERIES. • BY THE MID 1800S EARLY 1900S, BIOLOGY HAD BECOME INTERESTING TO NATURALISTS. • SINCE THAT TIME, BIOLOGISTS AND OTHER SCIENTISTS HAVE BECOME SPECIALISTS • Dr. H. R. Hermann

  20. Evolution, Genetics Embryo's and our Common Ancestor's • http://www.youtube.com/watch?v=h3Lkac890c0

More Related