Lesson 4 - Natural Selection
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artificial selection
domestication of plants and animals occurs in captivity +humans choose the specific trait
How did the Essay on the Principle of Population, by Thomas Malthus help Darwin
because of this there must be intense competition among individuals of the same species to survive favourable variations would be preserved, unfavourable ones destroyed.
What were Darwin’s observations?
1. Individuals within a species vary in many ways. 2. Some of this variability can be inherited. 3. Every generation produces far more offspring than can survive and pass on their variations. 4. Populations of species tend to remain stable in size.
Define Natural selection
A natural process that results in the survival and reproductive success of individuals best adjusted to their environment and that leads to future generations also suited for that environment
What are some unanswered questions Darwin had?
Limited fossil record, with many gaps and no transitional forms