Organisms without significant new heritable traits come out on top.īiological processes are essentially biological. It would rather leave things as they are than change them. Negative selection is a process that favors the current situation. This explains why people with hemophilia have fewer children than others since they can’t reproduce easily themselves and need medical assistance to do so. If an organism has a negative trait, it’s less likely to survive than organisms without those traits. These are bad things that lower the chance of survival, such as hemophilia in humans. Natural selection is usually driven by negative traits. Different species will vary in their reproductive success, meaning that some species will produce more offspring than others. Genetics plays a role in the growth of organisms. First, there is variability among individual organisms within the same species. The theory of natural selection can be divided into three parts. This means the best-adapted members of a species survive and reproduce, while their weaker counterparts die off. It was a book that challenged religious beliefs and shook up centuries of thinking about how humans came to be.ĭarwin believed that evolution was driven by natural selection. Big Idea #1: Evolution works according to the logic of natural selection and adaptation.Ĭharles Darwin published On the Origin of Species in 1859. Finally, you will discover why the birth of agriculture was both a blessing and a curse.
You’ll also learn why posture can shape the fortunes of an entire species. In this passage, you’ll learn about how natural selection interacts with environmental changes.
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