Concept explainers
To explain:
The non- external mechanism that Darwin proposed as a cause of variation.
Introduction: In Darwin’s time, most naturalists considered only external conditions as causes of variation but Darwin believed that there are some other causes as well that might be causing variation in organisms. Darwin gave a new theory about the origin of species.
Answer to Problem 35A
Natural selection is a mechanism that Darwin proposed as a cause of variation.
Explanation of Solution
Many contemporaries of Charles Darwin believed that external conditions of environment such as climate, food etc played a major role in causing variation in organisms. Darwin believed that while this may be true to some extent but there are some non- external factors also which cause variations.
Darwin proposed that there are some
Charles Darwin gave a theory of natural selection. He argued that if enough time is given, natural selection could modify a population to produce new species. There are four principles of this theory.
- Individual in a population show differences called variations.
- Variations can be inherited; i.e they can be passed down from parent to offspring.
- Organisms produce more offspring than can survive on available
resources . - Variations that increase reproductive success will have a greater chance of being passed on than those that do not increase reproductive success.
Later Darwin compiled evidence for evolution and explained how natural selection might provide a mechanism for development of new species.
Chapter 15 Solutions
Biology Illinois Edition (Glencoe Science)
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