Tinkering in Evolution and Sexual Selection in Animals

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Tinkering in Evolution and Sexual Selection in Animals

Discusses how natural selection tinkers with traits of organisms and talks about how animals chose mates through sexual selection

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University of Missouri
Anthro 2050 - Introduction to Biological Anthropology With Laboratory
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Anthro2050 1st Edition Lecture 6 Outline of Last Lecture I. More on Natural Selection II. Evidence for Evolution Outline of Current Lecture I. Evolution and Tinkering II. Sexual Selection Current Lecture Evolution and Tinkering: Evolution and natural selection are subject to the laws of physics and biology. New traits and characteristics cannot be added randomly and usually come from nature tinkering with components that are already there. Several examples are included: -Lungs: ancient aquatic creatures that lived in stagnant water found that if they swam to the surface and gulped at the air, they could get more oxygen. Over a long time sacs formed to collect this air and send it to the rest of the body. This marked the beginning of lungs and similar structures we see in animals today. There are some fishes and aquatic mammals that show that transition between gills and lungs. -Eyes: eyes have evolved three different times and all three designs work. if there was one design for eyes that worked best, it would be in all animals, however these designs show animals developing in the best way for their environments. Even animals that live fully in the dark, although they no longer use their eyes, still develop them because they were used in the past. Since evolution is limited by what is available and what is possible according to the laws of nature, there are some animals that just simply cannot exist. Although we cannot predict evolution one-hundred percent, we know the limitations and possibilities. - All of the animals that have existed and do exist (tigers, snakes, pterodactyls etc) These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.

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