Flashcards in Lesson 8 Deck (20):
Luke's hair gets gray over time, is this evolution?
No (his genes haven't changed)
Ants had eyes, but after living in a tunnel where they weren't needed, they stopped having eyes. Evolution?
Yes (genes changed over time)
Female peacocks liked males with long feathers. Over time all males grew long feathers?
Yes (species changing over time)
What did Darwin originally study when he went to college?
Why did Darwin want to become a pastor?
Free time to explore nature
Where did Darwin make his most famous observations?
The Galapagos Islands
Are all Darwin's ideas accepted as scientifically correct?
What does this graph represent?
Stabilizing selection (everyone moving towards the norm)
How was the moth population natural selection?
The color on the moths depended on the environment
When biologists use the term "survival of the fittest" what do they mean by "survival"?
Living long enough to reproduce
What do they mean by "fit"?
Having traits that help an organism produce healthy offspring
What's a homologous structure? (with EX)
A structure that's similar to one of another organism but used for a different purpose. EX: fins of a whale, for swimming and hands of a human, for holding things
What's an analogous structure?
Structures that are different by used for the same purpose
What are vestigial structures? (with EX)
Structures in an organism that are no longer used, EX:L tailbone in humans
How is point mutation different from insertion mutation?
Point is one base different from the original, insertion has new bases added in
How is deleted mutation different from inversion mutation?
In deletion mutation DNA is left out from duplicated chromosome, whereas in inversion mutation part of the chromosome is out of order
What must happen for a mutation to affect a gene pool?
It must have a phenotypic (physical) effect
What's hybrid sterility
speciation when two organisms interbreed but can't reproduce
Behavioral speciation occurs when...?
There must be a physical or chemical change for two species to mate