Creating a New Species
... Convergent: Two dissimilar species becoming structurally similar Environment selects for similar phenotype (but ancestors were different) ...
... Convergent: Two dissimilar species becoming structurally similar Environment selects for similar phenotype (but ancestors were different) ...
Document
... When two different species share a common ancestor, but have different characteristics from one another. Exmple; Darwin finches. Convergent evolution When two different species do not share a common ancesstor, but have developed similar characteristics through adaptation to similar environmental con ...
... When two different species share a common ancestor, but have different characteristics from one another. Exmple; Darwin finches. Convergent evolution When two different species do not share a common ancesstor, but have developed similar characteristics through adaptation to similar environmental con ...
Evolution
... 2. Inheritance of acquired characteristics—described how body features acquired during the lifetime of an organism could be passed on to offspring. (Is this true? Can this happen? ) ...
... 2. Inheritance of acquired characteristics—described how body features acquired during the lifetime of an organism could be passed on to offspring. (Is this true? Can this happen? ) ...
Notes Chapter 15 Evolution
... 1) The Beagle was chartered for a five-year mapping and collecting expedition to South America and the South Pacific 2) Darwin assumed the post of ship naturalist, which required that he collect specimens and keep careful records of his observations a. On the voyage, Darwin read Charles Lyell’s book ...
... 1) The Beagle was chartered for a five-year mapping and collecting expedition to South America and the South Pacific 2) Darwin assumed the post of ship naturalist, which required that he collect specimens and keep careful records of his observations a. On the voyage, Darwin read Charles Lyell’s book ...
Topic 13: Evolution
... This seahorse blends almost perfectly into its habitat. How could an organism like this arise? Each generation, the best camouflaged individuals survive to reproduce. The alleles conferring camouflage become more common in each generation. But natural selection does not create camouflage alleles. In ...
... This seahorse blends almost perfectly into its habitat. How could an organism like this arise? Each generation, the best camouflaged individuals survive to reproduce. The alleles conferring camouflage become more common in each generation. But natural selection does not create camouflage alleles. In ...
LET*S GO OVER THE BIG IDEAS *
... Natural Selection is a major mechanism of evolution • An adaptation is a genetic variation that is favored by selection and is manifested as a trait that provides an advantage to an organism in a particular environment. • In addition to natural selection, chance and random events can influence the ...
... Natural Selection is a major mechanism of evolution • An adaptation is a genetic variation that is favored by selection and is manifested as a trait that provides an advantage to an organism in a particular environment. • In addition to natural selection, chance and random events can influence the ...
Term 2 Revision Guide File
... Suppose a fossil skull is found. The teeth of the animal are small and flat, with no fangs or other sharp teeth. The eye sockets are more on the side of the head, not facing completely forward. What could this information tell you about this animal? ...
... Suppose a fossil skull is found. The teeth of the animal are small and flat, with no fangs or other sharp teeth. The eye sockets are more on the side of the head, not facing completely forward. What could this information tell you about this animal? ...
Natural Selection 2
... Natural Selection Leading to Adaptive Radiation • Life descends from shared ancestors • Changes over time via sexual reproduction, mutation etc • Favorable traits are selected for and therefore become more common in future generation - this is Natural Selection ...
... Natural Selection Leading to Adaptive Radiation • Life descends from shared ancestors • Changes over time via sexual reproduction, mutation etc • Favorable traits are selected for and therefore become more common in future generation - this is Natural Selection ...
8-5 Notes: Natural Selection
... • The environment is the selective agent Darwin said that in nature, the environment creates selective pressure ...
... • The environment is the selective agent Darwin said that in nature, the environment creates selective pressure ...
Natural Selection - LAHS | Life Science
... • The environment is the selective agent Darwin said that in nature, the environment creates selective pressure ...
... • The environment is the selective agent Darwin said that in nature, the environment creates selective pressure ...
26.1 Organisms Evolve Through Genetic Change Occurring
... • Variation detected by DNA sequencing ...
... • Variation detected by DNA sequencing ...
Natural Selection
... Natural selection explains how species evolve, or change, over time. Natural selection is based on several key principles: • Overproduction- Populations tend to produce more offspring than can possibly survive. • Inherited variation- Each individual has its own traits. • Competition- Because resourc ...
... Natural selection explains how species evolve, or change, over time. Natural selection is based on several key principles: • Overproduction- Populations tend to produce more offspring than can possibly survive. • Inherited variation- Each individual has its own traits. • Competition- Because resourc ...
Species are “fixed in form”!
... plants, it at once struck me that under these circumstances favourable variations would tend to be preserved, and unfavourable ones to be destroyed. The results of this would be the formation of a new species. Here, then I had at last got a theory by which to work". Charles Darwin, from his autobiog ...
... plants, it at once struck me that under these circumstances favourable variations would tend to be preserved, and unfavourable ones to be destroyed. The results of this would be the formation of a new species. Here, then I had at last got a theory by which to work". Charles Darwin, from his autobiog ...
Darwin and the Theory of Natural Selection
... effect on “weak” traits.) 1. “weak” vs. “strong”(Strong traits would be beneficial in surviving and reproducing; whereas, weak traits would not be beneficial to reproducing or surviving the harsh characteristics of that environment.) B. Environmental stresses affect the success rate of individuals i ...
... effect on “weak” traits.) 1. “weak” vs. “strong”(Strong traits would be beneficial in surviving and reproducing; whereas, weak traits would not be beneficial to reproducing or surviving the harsh characteristics of that environment.) B. Environmental stresses affect the success rate of individuals i ...
Classification - Baptist Hill Middle/High School
... • At least 80% of all phyla include marine species • More ways to “make a living” in the ocean ...
... • At least 80% of all phyla include marine species • More ways to “make a living” in the ocean ...
Unit 9: Populations and Evolution
... d. organisms which are distantly related 24. Horses and tapirs have a common ancestor, but now look very different. Horses now are grassland animals adapted for grazing on grass and shrubs. Tapirs are jungle animals that live in dense forests and eat fruit, leaves, and aquatic vegetation. Which of t ...
... d. organisms which are distantly related 24. Horses and tapirs have a common ancestor, but now look very different. Horses now are grassland animals adapted for grazing on grass and shrubs. Tapirs are jungle animals that live in dense forests and eat fruit, leaves, and aquatic vegetation. Which of t ...
Evolution and Natural Selection Unit
... The four parts to Darwin’s theories. Organisms have changed over time. Organisms share a common ancestor. Change is a slow process over many generations. Punctuated evolution shows us that it can during some periods speed up. The mechanism of evolutionary change was natural selection. Desc ...
... The four parts to Darwin’s theories. Organisms have changed over time. Organisms share a common ancestor. Change is a slow process over many generations. Punctuated evolution shows us that it can during some periods speed up. The mechanism of evolutionary change was natural selection. Desc ...
Evolution PowerPoint
... evolution. However, Darwin's theory did not explain sources of genetic variation Variations within a species increase the chance of survival when conditions change. ...
... evolution. However, Darwin's theory did not explain sources of genetic variation Variations within a species increase the chance of survival when conditions change. ...
Notes
... populations evolved from ancestral form. • 1838 After reading an essay by Thomas Malthus, he theorized some individuals would have a competitive advantage conferred by favorable characteristics. ...
... populations evolved from ancestral form. • 1838 After reading an essay by Thomas Malthus, he theorized some individuals would have a competitive advantage conferred by favorable characteristics. ...
Ch 16 Populations notes
... b. Geographic isolation- occurs when two populations are separated by geographic barriers such as rivers or mountains. i. Geographic barriers do not guarantee the formation of new species. ii. If two formerly separated populations can still interbreed, they remain a single species. iii. Potential ge ...
... b. Geographic isolation- occurs when two populations are separated by geographic barriers such as rivers or mountains. i. Geographic barriers do not guarantee the formation of new species. ii. If two formerly separated populations can still interbreed, they remain a single species. iii. Potential ge ...
Biology Unit 7 Ch. 13, 14, 15, 16 Evolution
... a. I can use the fossil record to infer the history and relatedness of life. b. I can explain how comparative anatomy provides evidence of shared ancestry. c. I can explain how embryology and development provides evidence. d. I can explain how the lines of evidence are used to determine relatedness. ...
... a. I can use the fossil record to infer the history and relatedness of life. b. I can explain how comparative anatomy provides evidence of shared ancestry. c. I can explain how embryology and development provides evidence. d. I can explain how the lines of evidence are used to determine relatedness. ...
Introduction to evolution
Evolution is the process of change in all forms of life over generations, and evolutionary biology is the study of how evolution occurs. Biological populations evolve through genetic changes that correspond to changes in the organisms' observable traits. Genetic changes include mutations, which are caused by damage or replication errors in an organism's DNA. As the genetic variation of a population drifts randomly over generations, natural selection gradually leads traits to become more or less common based on the relative reproductive success of organisms with those traits.The age of the Earth is about 4.54 billion years old. The earliest undisputed evidence of life on Earth dates at least from 3.5 billion years ago, during the Eoarchean Era after a geological crust started to solidify following the earlier molten Hadean Eon. There are microbial mat fossils found in 3.48 billion-year-old sandstone discovered in Western Australia. Other early physical evidence of a biogenic substance is graphite in 3.7 billion-year-old metasedimentary rocks discovered in western Greenland. More than 99 percent of all species, amounting to over five billion species, that ever lived on Earth are estimated to be extinct. Estimates on the number of Earth's current species range from 10 million to 14 million, of which about 1.2 million have been documented and over 86 percent have not yet been described.Evolution does not attempt to explain the origin of life (covered instead by abiogenesis), but it does explain how the extremely simple early lifeforms evolved into the complex ecosystem that we see today. Based on the similarities between all present-day organisms, all life on Earth originated through common descent from a last universal ancestor from which all known species have diverged through the process of evolution. All individuals have hereditary material in the form of genes that are received from their parents, then passed on to any offspring. Among offspring there are variations of genes due to the introduction of new genes via random changes called mutations or via reshuffling of existing genes during sexual reproduction. The offspring differs from the parent in minor random ways. If those differences are helpful, the offspring is more likely to survive and reproduce. This means that more offspring in the next generation will have that helpful difference and individuals will not have equal chances of reproductive success. In this way, traits that result in organisms being better adapted to their living conditions become more common in descendant populations. These differences accumulate resulting in changes within the population. This process is responsible for the many diverse life forms in the world.The forces of evolution are most evident when populations become isolated, either through geographic distance or by other mechanisms that prevent genetic exchange. Over time, isolated populations can branch off into new species.The majority of genetic mutations neither assist, change the appearance of, nor bring harm to individuals. Through the process of genetic drift, these mutated genes are neutrally sorted among populations and survive across generations by chance alone. In contrast to genetic drift, natural selection is not a random process because it acts on traits that are necessary for survival and reproduction. Natural selection and random genetic drift are constant and dynamic parts of life and over time this has shaped the branching structure in the tree of life.The modern understanding of evolution began with the 1859 publication of Charles Darwin's On the Origin of Species. In addition, Gregor Mendel's work with plants helped to explain the hereditary patterns of genetics. Fossil discoveries in paleontology, advances in population genetics and a global network of scientific research have provided further details into the mechanisms of evolution. Scientists now have a good understanding of the origin of new species (speciation) and have observed the speciation process in the laboratory and in the wild. Evolution is the principal scientific theory that biologists use to understand life and is used in many disciplines, including medicine, psychology, conservation biology, anthropology, forensics, agriculture and other social-cultural applications.