Theories of Evolution

Question 1

What is Lamarck’s theory?

Answer 1

• Law of use and disuse
• Law of inheritence and acquired characteristics
• The more a characteristic is used, the bigger and stronger it becomes, ones not used disappear
• Characteristics improved through use passed onto offspring
• Giraffe

Question 2

What is Darwin’s theory?

Answer 2

• Organisims compete for limited resources
• Individuals show natural variation
• Individual with characteristics best suited to their environment most likely to survive and reproduce
• Successful characteristica inherited
• Species unable to successfully compete become extinct
• Theory of natural selection
• Darwin’s finches

Question 3

What is the process of natural selection?

Answer 3

Variation: genetic variation within a population which can be inherited
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Competition: offspring overproduction leads to competition for survival
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Adaptations: individuals with beneficial adaptations more likely to survive and pass on their genes
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Selection: over many generations there is evolution

Question 4

ICE AGE

Answer 4

Inherited variation
Competition
Environmental pressures

Adaptations
Genotype frequency
Evolution