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Flashcards in B2f-natural Selection Deck (11)
1

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)

2

What are adaptations controlled by?

Genes
Can be passed on to next generation

3

What is speciation?

The development of a new species

4

What is evolution?

When groups of organisms change over time

5

How does reproductive isolation cause speciation?

Same species change
They cant interbreed to produce fertile offspring

6

How is reproductive isolation caused by geographic isolation?

-physical barrier divides population of species
-different mutations creates new features
-natural selection
-conditions on each side different
-individuals will have different features
-wont be able to breed together

7

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

8

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

9

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

10

Why was lamarcks theory discredited?

It didn't have a genetic basis

11

How has the theory of natural selection developed?

-DNA discovered
-new adaptations arise because of mutations
-successful adaptations passed on in genes that parents contribute