Microevolutionary Changes and Speciation (HSC SSCE Biology): Flashcards
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Biotic factors
Biotic factors
Living surroundings of organisms
4 main selection pressures
4 main selection pressures
Environmental change, competition, predation, disease
Microevolution
Microevolution
Changes over shorter periods within populations, no new species
Macroevolution
Macroevolution
Changes over millions of years, produces new species
Hyracotherium
Hyracotherium
First horse, dog-sized, forest-dwelling, 50 mya
Horse evolution trends (3)
Horse evolution trends (3)
Increased size, reduced toes (4 to 1), changed teeth
Monotremes
Monotremes
Egg-laying mammals, native to Australia & New Guinea
Platypus feature combination
Platypus feature combination
Bird bill/feet, reptile venom/eggs, mammal hair/milk
% genes common: platypus, marsupial, placental
% genes common: platypus, marsupial, placental
82%
Modern platypus specializations (2)
Modern platypus specializations (2)
No teeth (horny pads), electroreception system in bill