Reading 16-3: The Process of Speciation (pg. 404)
... 15. Where did the first finches on the islands come from? _____________________________________These first finches were called ____________________________________ 16. Over time, populations on the island became ________________________ to their local environments. 17. How do finches choose their ma ...
... 15. Where did the first finches on the islands come from? _____________________________________These first finches were called ____________________________________ 16. Over time, populations on the island became ________________________ to their local environments. 17. How do finches choose their ma ...
evolution and speciation ppt
... A cosmic explosion that hurled matter and in all directions created the universe 10-20 billion years ...
... A cosmic explosion that hurled matter and in all directions created the universe 10-20 billion years ...
Natural Selection
... In species that reproduce sexually, each individual inherits a new combination of alleles from that individual’s parents. As a result, each new generation is made up of genetically unique individuals. In addition, new mutations occur randomly in each generation, providing the potential for new trait ...
... In species that reproduce sexually, each individual inherits a new combination of alleles from that individual’s parents. As a result, each new generation is made up of genetically unique individuals. In addition, new mutations occur randomly in each generation, providing the potential for new trait ...
Fitness and Life Histories
... synchronized to environmental factors – The organism must start development early enough to allow for growth and eventual reproduction by the progeny – Instead of “hibernating – the univoltine organism can just die no loss to the species – Many insect species have Univoltine and ...
... synchronized to environmental factors – The organism must start development early enough to allow for growth and eventual reproduction by the progeny – Instead of “hibernating – the univoltine organism can just die no loss to the species – Many insect species have Univoltine and ...
Evolution 2
... divided into two separate populations by the development of a city. The two populations will most likely become separate species if the two populations are— ...
... divided into two separate populations by the development of a city. The two populations will most likely become separate species if the two populations are— ...
Darwin and Natural Selection
... Natural Selection: Survival of the Fittest An adaptation is any inherited characteristic (a genetic variation) that can increase an organism’s chance of survival. variation exists An the ...
... Natural Selection: Survival of the Fittest An adaptation is any inherited characteristic (a genetic variation) that can increase an organism’s chance of survival. variation exists An the ...
Exam 3 Jeopardy!
... Commensalism: when one benefits and the other is not affected Mutualism: when both are benefitted in the ...
... Commensalism: when one benefits and the other is not affected Mutualism: when both are benefitted in the ...
Natural Selection
... finches on Daphne Major, a small island (800 sq. yd) • In 1977: Island had only 2mm of rain instead of normal 130mm... drought resulted in a loss of 84% of medium ground finch population – most died of starvation – seeds of Tribulus cistoides, primary food source --> were hard to open unless birds h ...
... finches on Daphne Major, a small island (800 sq. yd) • In 1977: Island had only 2mm of rain instead of normal 130mm... drought resulted in a loss of 84% of medium ground finch population – most died of starvation – seeds of Tribulus cistoides, primary food source --> were hard to open unless birds h ...
xyzab
... • Darwin synthesized the concept of natural selection from two observations that were neither profound nor original – Others had the pieces of the puzzle, but Darwin could see how they fit together ...
... • Darwin synthesized the concept of natural selection from two observations that were neither profound nor original – Others had the pieces of the puzzle, but Darwin could see how they fit together ...
Evolution Review
... embryology, and fossils. The more criteria that are shared between organisms, the more likely they are closely related. 2. Relatedness can be shown using a “branching tree diagram”, or cladogram. Organisms that are closely related are next to each other on the same branch. More distant relations are ...
... embryology, and fossils. The more criteria that are shared between organisms, the more likely they are closely related. 2. Relatedness can be shown using a “branching tree diagram”, or cladogram. Organisms that are closely related are next to each other on the same branch. More distant relations are ...
Darwin`s Second Idea – Natural Selection
... % who think evolution is a scientific theory well supported by the evidence This class ...
... % who think evolution is a scientific theory well supported by the evidence This class ...
The History of Life
... Adaptive radiation is the RAPID evolution of a group of organisms following some large-scale disturbance. Adaptive radiation typically occurs when a few organisms make their way to new, often distant areas or when environmental changes cause numerous extinctions, opening up ecological niches for ...
... Adaptive radiation is the RAPID evolution of a group of organisms following some large-scale disturbance. Adaptive radiation typically occurs when a few organisms make their way to new, often distant areas or when environmental changes cause numerous extinctions, opening up ecological niches for ...
15 pre-test - saddlespace.org
... ____ 6. Lamarck’s theory of evolution includes the concept that new organs in a species appear as a result of a. continual increases in population size. b. the actions of organisms as they use or fail to use body structures. c. an unchanging local environment. d. the natural variations already prese ...
... ____ 6. Lamarck’s theory of evolution includes the concept that new organs in a species appear as a result of a. continual increases in population size. b. the actions of organisms as they use or fail to use body structures. c. an unchanging local environment. d. the natural variations already prese ...
Natural Selection - Solon City Schools
... The process by which favorable heritable traits become more common in successive generations of a population of reproducing organisms, and unfavorable heritable traits become less common. ...
... The process by which favorable heritable traits become more common in successive generations of a population of reproducing organisms, and unfavorable heritable traits become less common. ...
Unit 6 Evolution Chapter 19
... – Three inferences based on five observations • Observation 5: Much of this variation is heritable. – Inference 2: Survival in the struggle for existence is not random, but depends in part on the hereditary constitution of the surviving individuals. » Those individuals whose inherited characteristic ...
... – Three inferences based on five observations • Observation 5: Much of this variation is heritable. – Inference 2: Survival in the struggle for existence is not random, but depends in part on the hereditary constitution of the surviving individuals. » Those individuals whose inherited characteristic ...
Natural Selection
... immigration and emigration allow for the movement of genes, creating a more diverse gene pool ...
... immigration and emigration allow for the movement of genes, creating a more diverse gene pool ...
Ch 15 Darwin`s Theory of Evolution
... 26. The evolution of an ancestral species into an array of species that occupy diverse habitats is called ____________________. 27. Any structure that is reduced in function in a living organism but may have been used in an ancestor is known as a(n) ____________________. 28. The concept that evolut ...
... 26. The evolution of an ancestral species into an array of species that occupy diverse habitats is called ____________________. 27. Any structure that is reduced in function in a living organism but may have been used in an ancestor is known as a(n) ____________________. 28. The concept that evolut ...
Life Over Time - chapter 6
... finches - types of beaks - B. Natural selection explains how living things evolve. 1. Overproduction - MANY offspring! 2. Variation – natural or mutation 3. Adaptation – benefit or drawback????? 4. Selection - “survival of the fittest” ...
... finches - types of beaks - B. Natural selection explains how living things evolve. 1. Overproduction - MANY offspring! 2. Variation – natural or mutation 3. Adaptation – benefit or drawback????? 4. Selection - “survival of the fittest” ...
Read these reviews and answer the questions
... I. Evolution Practice Worksheet Directions: Circle the correct answer in questions 1 – 17. 1. The process in which the environment puts pressure on a species to change: (evolution or natural selection) 2. Slow change in a species over time describes Darwin’s theory of (evolution or natural selection ...
... I. Evolution Practice Worksheet Directions: Circle the correct answer in questions 1 – 17. 1. The process in which the environment puts pressure on a species to change: (evolution or natural selection) 2. Slow change in a species over time describes Darwin’s theory of (evolution or natural selection ...
Evolutionary Biology is Important to Health Science
... a. Lyell—suggested physical changes to Earth result from geologic processes occurring over long periods of time. b. Lamarck—proposed that organisms adapt to their environment. c. Darwin—developed the theory of natural selection as a mechanism of change in species. d. Malthus—thought that characteris ...
... a. Lyell—suggested physical changes to Earth result from geologic processes occurring over long periods of time. b. Lamarck—proposed that organisms adapt to their environment. c. Darwin—developed the theory of natural selection as a mechanism of change in species. d. Malthus—thought that characteris ...
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.