Unit 8 Evolution
Terms in this set (30)
Shows change over time in fossil record.
In rock layers, horse bones show slight changes, what does this support?
This image is which type of structure?
True or False. These structures support a common ancestor theory.
Appendix, wisdom teeth, whale pelvis are all examples of:
because there are similarities in early stages, there was a common ancestor
The study of these embryos supports:
Through the genes in DNA
How are traits passed to offspring?
how environment affected specie adaptations
Lamarck and Darwin both studied:
picking traits to breed through using genetics
What is artificial selection?
Too much of a population, they can't all survive
What is overproduction?
Survival of the fittest. Those with best traits for the environment survive and reproduce.
What is natural selection?
genetic variation, reproduction, some better suited, environments vary
What are elements of natural selection?
steady food production & exponential population growth
Malthus graph shows what 2 things?
Geologist that stated processes change earth over time.
Green and yellow frogs have a split population. 50% green and 50% yellow. Is yellow, green or neither color the "best trait"?
Genetic traits that help an organism live and reproduce...passed down to future generation.
What are adaptations?
Some bacteria resist antibiotics and past that resistance onto their offspring
An example of evolution in bacteria:
by chance, some organisms leave behind more offspring
What is genetic drift?
Migration or genes moving into or out of a population
What is gene flow?
Bringing NEW organisms to a different location
What is founder effect?
Random wiping out of populations or most of a population...ex: tsunami, mudslide, avalanche
What is the bottle neck effect?
reproduce and their offspring must also be fertile (able to reproduce)
In order to be the same specie, the two must be able to:
The birds with the best beak for the food source lived and reproduced passing the "fittest" beak to its offspring.
Why did Darwin's finches have different beaks on different islands?
Variety of rabbit fur colors: white rabbits, black rabbits, white rabbits with black speckles
Example of genetic variation:
One male peacock has very bright blue and green feathers, while another male peacock has only mildly blue and green feathers,
Example of individual adapted better by chance.
Desert gets less than 10 inches of rain yearly.
Example of the environments varying with different challenges.
In the fish lab, orange over yellow
Example of : individuals best suited to the environment become dominant in that population leaving more offspring
Bacteria that is not killed by antibiotics because they were only weakened or had a mutation that allowed it to live AND passed it onto its offspring.
What is antibiotic resistance?
Do these represent the same species in each cladogram? Yep or nope
Which is most closely related to the chimp?
Did not know how traits were inherited; he assumed these acquired characteristics were passed on to offspring.
What was Lamarck's mistake?