Chapter 15

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How might a new competitor cause the extinction of a species?
The original species may be left with too little to eat
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Suggest THREE factors that could change in a habitat area, causing problems for the organisms living there?
The climate may change, a new predator may move into the area, a new disease may affect the population
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What is the main difference between Lamarck's theory of evolution and Darwin's theory?
Lamarck suggested that characteristics which developed during the lifetime of the organism could be passed on. Darwin said that organisms with the best characteristics survived to breed and the offspring inherited the characteristic
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Why is there variation between members of the same species?
If the offspring are produced by sexual reproduction, then the genes of both parents are inherited in different combinations when the gametes fuse
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What is meant by 'natural selection'?
Those that are best adapted or suited to their environment live long enough to breed. The weaker ones may die before they breed
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Why do biologists draw evolutionary trees?
Evolutionary trees show the relationships between organisms and whether they had common ancestors
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What is meant by 'geographical isolation'?
Two populations of an organism become separated and live in two different regions, for example two sides of a new river
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Card 2

Front

Suggest THREE factors that could change in a habitat area, causing problems for the organisms living there?

Back

The climate may change, a new predator may move into the area, a new disease may affect the population

Card 3

Front

What is the main difference between Lamarck's theory of evolution and Darwin's theory?

Back

Preview of the front of card 3

Card 4

Front

Why is there variation between members of the same species?

Back

Preview of the front of card 4

Card 5

Front

What is meant by 'natural selection'?

Back

Preview of the front of card 5
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