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Oct 19, 2023 · Learn how natural selection is the process of adaptation and evolution through genetic variation and inheritance. See examples of natural selection in action, such as Darwin's finches and pigeon breeding.
Natural selection is one of the basic mechanisms of evolution, along with mutation, migration, and genetic drift. Darwin’s grand idea of evolution by natural selection is relatively simple but often misunderstood. To see how it works, imagine a population of beetles: There is variation in traits. For example, some beetles are green and some ...
- Elephant Tusks
- Pest Resistance
- Clover and Cyanide
- Natural Selection in Humans
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African elephants typically have large tusks. The ivory in the tusks is highly valued by some people, so hunters have hunted and killed elephants to tear out their tusks and sell them (usually illegally) for decades. Some African elephants have a rare trait: They never develop tusks at all. In 1930, about 1 percent of all elephants had no tusks. Th...
The bollworm, a pest that eats and damages cotton crops, has shown that natural selection can act even faster than scientists can genetically engineer something. Some cotton crops have been genetically modified to produce a toxin that's harmful to most bollworms. A small number of bollworms had a mutation that gave them immunity to the toxin. They ...
Some species of clover developed a mutation that caused the poison cyanide to form in the plant's cells. This gave the clover a bitter taste, making it less likely to be eaten. However, when the temperature drops below freezing, some cells rupture, releasing the cyanide into the plant's tissues and killing the plant. In warm climates, natural selec...
What about humans? Are we subject to natural selection as well? It's certain that we were — humans only became humans because an assortment of traits (larger brains, walking upright) conferred advantages to those primates that developed them. But we're capable of influencing the distribution of our genes directly. We can use birth control, so that ...
Learn how natural selection drives evolution by favoring the best-suited traits in a population. See examples of natural selection in action, from fish to flowers to humans.
- Ed Grabianowski
Learn how Charles Darwin proposed the idea of biological evolution by natural selection, based on his observations of finches in the Galápagos Islands. Explore the key points, examples, and evidence of his theory and its implications for modern biology.
- Very good! You've correctly deduced an important evolutionary process known as co-evolution. This phenomenon is a key to understanding not just pre...
- From the Homo Sapiens book, Yuval shared a very simple but reasonable concept that standing on 2 legs on the ground will give more broad and wide o...
- Natural selection favors traits that are better for the ORGANISM'S survival and reproduction not for the environment. So actually the inverse would...
- Of course, natural selection just selects for the organisms that will be the most fit (have the most offspring) in a particular environment. One si...
- Natural selection is a mechanism that makes any species - be it a plant, animal, fungus, bacteria, you name it - better adapted to their environmen...
- That's not how science works. You can come up with any ridiculous theory and find as many evidences for it you please. What you should do is to cre...
- Not sure about animal species. In-plant kingdom it occurs and helps the creation of new species or more 'potent' for agriculture, such as watermelo...
- Over time this will happen. This is an important part of evolution called co-evolution, where the evolution of one species affects the evolution of...
- Darwin's concept of natural selection was based on several key observations: -Traits are often heritable. In living organisms, many characteristics...
- There have been other theories but they disagree with observations that the theory of evolution through natural selection explains.
Jan 15, 2021 · Learn how natural selection is a pressure that causes groups of organisms to change over time due to genetic variability and environmental factors. See examples of stabilizing, directional, diversifying, and sexual selection in different species.
- Gabe Buckley
Learn how natural selection works at the level of genes, alleles, genotypes, and phenotypes. See examples of how natural selection can cause microevolution and make populations adapted to their environment.
Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations. Charles Darwin popularised the term "natural selection", contrasting it with artificial selection, which is ...
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