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AT1Q2
Formation of life--dates
| Question | Answer |
|---|---|
| When did the earth form? | 4.6 bya |
| How old is the oldest fossil? | 3.5 bya |
| What was it of? | Prokaryotes (no nucleous, uni cellular) |
| When was the evidance of atmosphere? | 2.7 bya |
| Who was the atmosphere produced by? | Photosynthetic prokaryotes, the prokaryotes which evolved to bbe able to use Oxygen in aerobic respritation) |
| When did the 1st eukaryotes form? | 2.1-2.2 bya |
| How did eukaryotes arise? | Through endocynbiosis |
| endosymbionts vs. symbionts: | Living inside the other (host) vs live in close proximity and have some cological relationship |
| Serial Endosymbiotic Theory: | Series of steps that explain evolution of eukaryotes |
| What is the first step of the E Theory? | Infolding of plasma membrane, Nuclear envelope, and other internal membranes |
| Second step? | Engulfing aerobic prokaryotes-->mitochnondria |
| Thrid? | Engulfing photosynthetic prokaryotes-->Chloriplast |
| Evidance for endocymbiotic theory? | Size, method of dividing, nucleotide sequences, ribosome type, sesitive to antibiotics |
| When did multicellular organisms form? (Like animals) | 1.2-1.5 bya |
| What were the multi-cell organsimsm? | Colonies w/ some specialization which increases effieciency, 1st animals appear |
| When did the cambrian explosion happen? | 542-525 mya |
| Adaptive radiation: | Many new organisms evolve over time |
| Why did adaptive radiation occur? | Natural selection, oxygen allowed larger animals to survive, hox genes went wild |
| When did the colonization of land occur? | 500 mya |
| Permian mass extinction occured when? WHy? | 250 mya, volcanic explosions (Volcanic eruptions led to ahses cover sun) |
| Prosiminans: | Mostly noctoral, small species of monkeys |
| Important characteristics of arboreal life important in humans: | Limber shoulder joint, Dextreous hands, streoscopic vision, hand-eye coordination, extended parental care, single births |
| What does arboreal mean? | Tree living |
| How many moninid species? | 20, they are more closely related to humans than chimps |
| Mosiac evolution: | Differing rates of evolution for different features, example: walking upright earlier than jaw changes |
| Was more than one species present at a time? | Yes |
| First Bipedal hominids | 5 mya |
| Cretaceous Extinction: happened when? | Dinasaurs went extinct, due to meteor strike on earth, 65 mya |
| Bipedalism evolved: | 4.4 mya |
Created by:
talkglitter2486