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Biology Chapter 10 > Evolution > Flashcards

Flashcards in Evolution Deck (6)
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1

Define evolution.

The change in organisms over many generations.

2

What did Darwin observe?

Members showed variation
Individuals had the potential to produce large numbers of organisms but the number of adults remained constant
Resources were limited

3

What did Darwin deduce?

There is a ‘struggle for existence’ with only the fittest surviving
Those that survive reproduce and their offspring have the characteristics they need to succeed.
In time a group of individuals undergo many changes and becomes sufficiently distinct to belong to a new species.

4

Why is natural selection a continuous process?

If the environmental conditions change, the features needed to survive in it change so it is continuous n

5

What is natural selection and evolution, described in modern terms)

There is competition for limited resources and those individuals that have alleles providing a better adapted phenotype reproduce more successfully. They pass the alleles that produce the phenotype to their offspring and so this continues over generations. The average phenotype changes.

6

What are 2 types of evolutionary product?

Adaptations are features used in an original form
Expaptations are structures that appear to have their original use modified.