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Natural selection is a mechanism of evolution. In this episode, Pinky and Petunia discuss the relationship of natural selection and antibiotic resistance in bacteria. Part of "The Amoeba Sisters" series.
(Source: DCMP)
Natural selection is a process which affects every species on Earth, including humans. Illustrates how it continues to affect humans all in fundamental ways that will determine the future survival as the species. Includes a brief explanation of natural selection, examples of how it is operating all around humans, how it has affected human evolution, and how it is still affecting daily lives. Concludes with the reciprocal view of how modern human society is affecting the processes in the environment, and the consequences for the future of life on Earth.
The rock pocket mouse is a living example of Darwin's process of natural selection. Not only is evolution happening right now everywhere around us, but adaptive changes can occur in a population with remarkable speed. This speed is essential if you're a desert mouse living in an environment where a volcanic eruption can reverse selective pressure in nearly an instant. Features Dr. Michael Nachman, whose work in the field and in the lab has quantified the selective pressure of predators and identified the genes involved in adaptation. From ecosystem to molecules, pocket mice show the viewers how random changes in the genome can take many paths to the same adaptation-a colored coat that hides them from predators.
In some parts of the world, there is an intimate connection between the infectious parasitic disease "malaria" and the genetic disease "sickle-cell anemia." A keenly observant young man named Tony Allison, working in East Africa in the 1950s, first noticed the connection and assembled the pieces of the puzzle. His story stands as the first and one of the best understood examples of natural selection, where the selective agent, adaptive mutation, and molecule involved are known--and this is in humans to boot. The protection against malaria by the sickle-cell mutation shows how evolution does not necessarily result in the best solution imaginable but proceeds by whatever means are available.
In some parts of the world, there is an intimate connection between the infectious parasitic disease "malaria" and the genetic disease "sickle-cell anemia." A keenly observant young man named Tony Allison, working in East Africa in the 1950s, first noticed the connection and assembled the pieces of the puzzle. His story stands as the first and one of the best understood examples of natural selection, where the selective agent, adaptive mutation, and molecule involved are known-and this is in humans to boot. The protection against malaria by the sickle-cell mutation shows how evolution does not necessarily result in the best solution imaginable but proceeds by whatever means are available.
The rock pocket mouse is a living example of Darwin’s process of natural selection. Not only is evolution happening right now everywhere around us, but adaptive changes can occur in a population with remarkable speed. This speed is essential if you’re a desert mouse living in an environment where a volcanic eruption can reverse selective pressure in nearly an instant. The film features Dr. Michael Nachman, whose work in the field and in the lab has quantified the selective pressure of predators and identified the genes involved in adaptation. In a complete story, from ecosystem to molecules, pocket mice show us how random changes in the genome can take many paths to the same adaptation—a colored coat that hides them from predators.
The tragic 2013-2015 Ebola outbreak in West Africa shocked the world. Computational geneticist Pardis Sabeti and disease ecologist Lina Moses explain the science behind how this event became the largest Ebola outbreak in history. Part of the “Think Like a Scientist” series.
Working in Gorongosa National Park, Mozambique, Dr. Joyce Poole and colleagues make a striking observation: many female elephants lack tusks. Elephant tusks are important for obtaining food and water, and essential to male elephants for competing for mates. There is a strong natural selection for having tusks; however, Dr. Poole has discovered the proportion of tuskless elephants has increased in some populations. She explains possible reasons for the increase in the number of elephants lacking tusks.
Follows scientists as they explore the mysteries of attraction, natural selection, and survival of the fittest in the male animal kingdom. The scientists use unorthodox techniques and the latest technology to study how males in the animal kingdom achieve their main goal of passing their genes to the next generation. For some species in the animal kingdom, males will go to extremes to win a mate. They make music, fight, overdress, and even agree to be eaten alive to ensure survival of the fittest.
From fossil evidence, it appears that life may have existed on Earth as early as 3.5 billion years ago. This suggests that life must have evolved sometime during Earth's tumultuous first billion years. How did life evolve? What did early forms of life look like? Topics covered include protocells, endosymbiosis, prokaryotes, eukaryotes, evolution, heredity, variation, natural selection, genetic drift, and gene flow. Part of the "Biology" series.
British naturalists Charles Darwin and Alfred Russel Wallace both set out on epic adventures to study various species and their development. They gathered evidence on the variation among individual members of a species, the relationships among species, and the patterns of geographic distribution across many species. Based on such evidence, they independently came to the same revolutionary conclusions: species change over time by means of natural selection, and species descend from other species.
Charles Darwin’s father wants him to be a pastor, but Darwin has a passion for science. At the encouraging of his uncle, he boards a Royal Navy ship known as the HMS Beagle. The voyage lasts for five years, and Darwin’s discoveries will revolutionize science. During the voyage, he spends most of his time on land performing methodical observations, which lead to his theories on evolution and natural selection. Part of the “Butterfly Effect” series.
Over the past four decades, evolutionary biologists Rosemary and Peter Grant have documented the evolution of the famous Galápagos finches. They track changes in body traits directly tied to survival, such as beak length, and identify behavioral characteristics that prevent different species from breeding with one another. Their pioneering studies have revealed clues as to how 13 distinct finch species arose from a single ancestral population that migrated from the mainland 2 million to 3 million years ago.
Investigates the reasons why cattle and humans have been linked together for over 30,000 years. Analyzes the anatomy of the cow's stomach, detailing the purpose of each chamber. Visit the Masai with their cattle herds and the sacred cows of India. Introduces the main cattle breed of the 800 breeds developed in England, explaining how artificial selection is used to produce desirable characteristics. Also introduces British dairy cow detailing the working of the udder and teats and the use of genetic engineering to increase milk production. Interviews Eric Schlosser, an author about the development of slaughterhouse methods in America. Also visits a family ranch where cattle are being raised in natural conditions under a grass management system.
The Earth has many natural resources humans use every day. Students also investigate the difference between renewable and nonrenewable resources.
A cycle or rhythm is a repetition of behaving in a regular pattern. There are many natural cycles for living and nonliving things on earth. Covers circadian rhythm (behavior based on a 24-hour cycle), annual rhythm (based on a yearly cycle), the water cycle, and the oxygen and carbon cycle. Highlights familiar examples of each. Quiz after summary.
Experiments illustrate the presence and properties of: 1) saccharides (glucose and starch) in fruits and vegetables; 2) lipids (fats) in nuts and vegetable oils; and 3) proteins in eggs, meat, and milk. Emphasizes that chemistry is all around us.
Provides an overview of some natural and human-made wonders of the world. Natural forces created mountains and canyons, unique bodies of water, and diverse ecosystems. People made ancient cliff dwellings, Stonehenge, pyramids, the Great Wall, and Hoover Dam, some very significant structures. All reveal the history of earth and its inhabitants.
Hear from a forest services manager who leads projects for forest health and sustainability. He discusses the importance of math, science, writing, and communication in the field of forestry. Learn about the many careers available in the area of natural sciences. Part of the "Career Connections" series.
How do spiders make their webs? Turns out it’s in their DNA. Spider expert and American Museum of Natural History curator Cheryl Y. Hayashi discusses her research into spider silk.
Showing collections 1 to 6 of 6
Biology related concepts
A collection containing 59 resources, curated by Benetech
Resources to teach younger students about animals
A collection containing 58 resources, curated by DIAGRAM Center
3D models and images of the entire periodic table of elements
A collection containing 118 resources, curated by Library Lyna
A collection of simulations from PhET.
A collection containing 15 resources, curated by Charles LaPierre
Collection of anatomy resources
A collection containing 21 resources, curated by Benetech
A collection of Chemistry related resources
A collection containing 67 resources, curated by Benetech
