1 / 16

FUN FACT: How long does evolution take?

FUN FACT: How long does evolution take?. Bacteria – can reproduce every 20 minutes…so after 2 days (48 hours), there has already been 144 generations born!!! (That’s 2.2 X 10 43 bacteria born!) That’s why bacteria can evolve in a shorter time period.

heulwen-evans
Télécharger la présentation

FUN FACT: How long does evolution take?

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. FUN FACT: How long does evolution take? Bacteria – can reproduce every 20 minutes…so after 2 days (48 hours), there has already been 144 generations born!!! (That’s 2.2 X 1043 bacteria born!) That’s why bacteria can evolve in a shorter time period. Humans – In order to have 144 generations (reproducing every 25 years), it will take us 3,600 years!! That’s why it takes so much longer for humans to evolve.

  2. DARWIN’S CURIOSITY…. • LED HIM TO THE SCIENTIFIC THEORY OF EVOLUTION BY WAY OF: NATURAL SELECTION!!

  3. Wild mustard & domestic cruciform vegetables Darwin knew about artificial selection, and argued that a similar process must occur in nature. Domestic dogs Wild canis

  4. NATURAL SELECTION ORGANISMS THAT ARE BETTER ADAPTED SURVIVE. THEY REPRODUCE AND PASS ON THEIR SUCCESSFUL TRAITS TO THEIR OFFSPRING.

  5. WHAT CAUSES NATURAL SELECTION? 1. OVERPRODUCTION =MORE OFFSPRING PRODUCED BY THE SPECIES THAN CAN LIVE DUE TO LIMITED RESOURCES *this way when some die, hopefully at least one or a few will live

  6. OVERPRODUCTION LEADS TO…. 2. COMPETITION FOR RESOURCES Living space Food Water

  7. What else affects Natural Selection? GENETIC VARIATIONS MEMBERS OF THE SAME SPECIES DIFFER FROM EACHOTHER

  8. WHAT DO VARIATIONS IN SPECIES RESULT FROM?? MUTATIONS in GENES- RANDOM CHANGES IN DNA THAT LEAD TO NEW TRAITS THESE CAN BE PASSED ON TO THE NEXT GENERATION

  9. What do variations in species result from?? SEXUAL REPRODUCTION Makes new genetic combinations and traits when mixing DNA

  10. Organisms with variations that are BEST SUITED to the environment can out-compete others… This means they will be able to survive longer and have more offspring

  11. HAVING MORE OFFSPRING MEANS… • PASSING YOUR GENES (which code for traits) ON TO MORE INDIVIDUALS

  12. OVER GENERATIONS… individuals have more and more helpful variations individuals have less and less harmful variations

  13. HOW DO NEW SPECIES FORM?? GEOLOGICAL ISOLATION =species separated by a barrier into 2 different areas

  14. What are barriers?? • BARRIERS CAN INCLUDE: OCEANS ISLANDS RIVERS MOUNTAINS VOLCANOES

  15. Over generations… • Each population changes to adapt to its environment Ursus maritimus Ursus americanus Ursus arctos

  16. THE POPULATIONS CHANGE SO MUCH THAT… if the barrier is removed, the individuals from the different groups cannot mate with each other at this point, they are considered separate species.

More Related