Describe natural selection AND describe an example of natural selection
Natural selection is a process that occurs when: A population experiences overproduction of offspring. The members of the population have genetic variation. So
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15
Describe what bottleneck effect is.
Eliminating a large portion of the population (catastrophic event) and few genetic variations are left remaining
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15
Anatomy/Anatomical
Different organisms share similar structures that have very different functions, or have remnants of structures/organs that had a function in the past.
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15
What do we mean by the โgene poolโ?
The gene pool is all of the possible variations of a gene. For example: the gene pool for human hair is blonde, brown, black, red, and grey/white. There are sha
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15
Would a fossil from layer F be older or younger than a fossil from layer B
Younger- it sits on top of B on both sides of the fault line.
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seesaw
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seesaw
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gift
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thief
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banana
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gold
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rocket
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lifesaver
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15
What type of interaction occurs when limited resources are available for organism to use? How does this interaction impact an organismโs ability to survive and reproduce?
Competition occurs when limited resources are available. Organisms that โwinโ the competition are able to survive and reproduce, organisms that โloseโ the compe
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15
Some adaptations can include camouflage and mimicry. State how each help an organisms survive below: Camouflage
the ability of an organism to blend in with its environment. This helps the organism hide from potential predators (so they donโt get eaten) and prey (so they
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15
GENE FLOW
The random movement of individual organisms between two populations of a species. They are able to bring their unique combination of traits to the new populatio
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In Madagascar scientists have discovered a moth, Xanthopan morganii praedicta, that has a 30.5 cm proboscis and feeds from and pollinates Darwinโs orchid, Angraecum sesquipedale. The orchid has a nectar-producing tube that is 27.9 cm long.
The moth has little competition for food
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NATURAL SELECTION
The gradual (slow) change in a populationโs characteristics over time, due to environmental pressures. Does this process increase or decrease genetic variatio
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15
Do these organisms have a common ancestor?
No
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15
Which layer is the oldest?
I
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lifesaver
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15
Explain below how we use Biogeography as evidence for evolution.
We look at how organisms are distributed around the world and can see evidence of how different environments select for different features. For example: when Da