Flashcards in B2f-natural Selection Deck (11)
What is Darwin's theory of evolution?
-organisms in a species show wide variation
-compete for limited resources
-best adapted will survive(survival of the fittest)
-inheritance of successful adaptations
(Pass on adaptations to offspring)
What are adaptations controlled by?
Can be passed on to next generation
What is speciation?
The development of a new species
What is evolution?
When groups of organisms change over time
How does reproductive isolation cause speciation?
Same species change
They cant interbreed to produce fertile offspring
How is reproductive isolation caused by geographic isolation?
-physical barrier divides population of species
-different mutations creates new features
-conditions on each side different
-individuals will have different features
-wont be able to breed together
Why was the theory of natural selection controversial at first?
-went against religious beliefs about how life on earth developed(didn't need a creator)
-darwin couldn't explain why new characteristics appeared or how they were inherited
-not enough evidence to convince other scientists
Not many other studies had been done
Why is the theory of natural selection now widely accepted?
It explains a wide range of observations
It has been discussed and tested by a wide rang of scientists
What was lamarcks theory?
-if a characteristic was used a lot then it would be more developed
-these acquired characteristics could be passed on to offspring
Why was lamarcks theory discredited?
It didn't have a genetic basis