ch16_lecture
... Darwin’s Theory A population can change over time when individuals differ in one or more heritable traits that are responsible for differences in the ability to survive and reproduce ...
... Darwin’s Theory A population can change over time when individuals differ in one or more heritable traits that are responsible for differences in the ability to survive and reproduce ...
We saw the evidence… but HOW does evolution happen?
... Example: A population of birds uses their beaks to dig into the soil and find worms to eat. The birds have a variety of beak sizes, but since there was always an abundant supply of worms all of the birds were able t feed. One spring the worm population decreased dramatically due to a disease and the ...
... Example: A population of birds uses their beaks to dig into the soil and find worms to eat. The birds have a variety of beak sizes, but since there was always an abundant supply of worms all of the birds were able t feed. One spring the worm population decreased dramatically due to a disease and the ...
Charles Darwin
... A group of closely related organisms that are capable of mating and producing fertile offspring. ...
... A group of closely related organisms that are capable of mating and producing fertile offspring. ...
Fossils - pams
... Reasoned that if the human population continued to grow unchecked, sooner or later there would be insufficient living space and food for everyone ...
... Reasoned that if the human population continued to grow unchecked, sooner or later there would be insufficient living space and food for everyone ...
Evolution Guided Notes
... How did the first living cells appear? o ____________________________________________ of small organic molecules o Joining of these molecules into _________________________________ o Packaging of these molecules into ___________ ...
... How did the first living cells appear? o ____________________________________________ of small organic molecules o Joining of these molecules into _________________________________ o Packaging of these molecules into ___________ ...
Chapter 11: Evolution and Natural Selection
... •Microevolution Evolutionary change on a small scale Encompasses the genetic changes that occur within a species over time These changes are the result of changes in gene frequencies ...
... •Microevolution Evolutionary change on a small scale Encompasses the genetic changes that occur within a species over time These changes are the result of changes in gene frequencies ...
lamarck`s theory
... • Wrote to Darwin to get advice on his theory of evolution. His theory was based on Natural Selection. • Darwin freaks! This is his work of 20 years! • Fellow scientist at the Royal Society decided to let the two present their theories. • Darwin’s was accepted based on his years of accumulated ...
... • Wrote to Darwin to get advice on his theory of evolution. His theory was based on Natural Selection. • Darwin freaks! This is his work of 20 years! • Fellow scientist at the Royal Society decided to let the two present their theories. • Darwin’s was accepted based on his years of accumulated ...
Powerpoint on Natural Selection
... characteristics from one generation to the next. • Individuals who are the most genetically “fit”, survive to reproduce (called natural selection or “survival of the fittest”) and pass on their fit characteristics. ...
... characteristics from one generation to the next. • Individuals who are the most genetically “fit”, survive to reproduce (called natural selection or “survival of the fittest”) and pass on their fit characteristics. ...
Charles Darwin - Paradise Primary School
... o some of these changed organisms were better suited to their environment than others and therefore they survived better o they passed these features/characteristics to their offspring He thought that over a very long time many changes resulted in a new species Because environments changed he th ...
... o some of these changed organisms were better suited to their environment than others and therefore they survived better o they passed these features/characteristics to their offspring He thought that over a very long time many changes resulted in a new species Because environments changed he th ...
LECTURE 1: Evolution Theories
... Hypothesis: Plants and animals are capable of producing far more offspring than resources can support; the “struggle for existence” (e.g., famine, war) is an inescapable consequence Each Species Struggles For: o __________________________________ o __________________________________ o ____________ ...
... Hypothesis: Plants and animals are capable of producing far more offspring than resources can support; the “struggle for existence” (e.g., famine, war) is an inescapable consequence Each Species Struggles For: o __________________________________ o __________________________________ o ____________ ...
Chapter 11 Power Point
... Genetic variation in a population increases the chance that some individuals will survive. • Genetic variation leads to phenotypic variation. • Phenotypic variation is necessary for natural selection. • Genetic variation is stored in a population’s gene pool. – made up of all alleles in a populatio ...
... Genetic variation in a population increases the chance that some individuals will survive. • Genetic variation leads to phenotypic variation. • Phenotypic variation is necessary for natural selection. • Genetic variation is stored in a population’s gene pool. – made up of all alleles in a populatio ...
Evolution and Natural Selection
... No one knew how old the earth was, but geologists were beginning to make estimates that the earth was considerably older than explained by biblical creation. Geologists were learning more about strata, or layers formed by successive periods of the deposition of sediments. This suggested a time seque ...
... No one knew how old the earth was, but geologists were beginning to make estimates that the earth was considerably older than explained by biblical creation. Geologists were learning more about strata, or layers formed by successive periods of the deposition of sediments. This suggested a time seque ...
10.1-Intro to Evolution
... Suppose that Tyson had genes that he passed on to his cubs that helped his cubs to resist infections on the African plains. This means his cubs were more likely to survive to adulthood. These genes would be more common in the next generation, since more of the cubs with these genes would survive to ...
... Suppose that Tyson had genes that he passed on to his cubs that helped his cubs to resist infections on the African plains. This means his cubs were more likely to survive to adulthood. These genes would be more common in the next generation, since more of the cubs with these genes would survive to ...
Describe an example of how natural selection influenced the
... from our ancestors, compared with the apes, we have higher intelligence, however their muscle strengths are much stronger than ours. This is an example of natural selection at work, humans evolved to have higher intelligence so as to adapt to the society while apes evolved to have strong arms so tha ...
... from our ancestors, compared with the apes, we have higher intelligence, however their muscle strengths are much stronger than ours. This is an example of natural selection at work, humans evolved to have higher intelligence so as to adapt to the society while apes evolved to have strong arms so tha ...
Ch 14-15 exam review EVOLUTION
... 4. How does the “Absolute Age” compare to the “Relative Age?” 5. Review the basics of History of life on earth (Ch 14) 6. What did Darwin observe on the Galapagos Islands? What did he notice about the finches? 7. Review Lamarck’s theory of evolution. What was his major concept for the Theory of Evol ...
... 4. How does the “Absolute Age” compare to the “Relative Age?” 5. Review the basics of History of life on earth (Ch 14) 6. What did Darwin observe on the Galapagos Islands? What did he notice about the finches? 7. Review Lamarck’s theory of evolution. What was his major concept for the Theory of Evol ...
Social Darwinism - The British Empire
... chance of survival and thus be naturally selected. From the strong principle of inheritance, any selected variety will tend to propagate its new and modified form.” ...
... chance of survival and thus be naturally selected. From the strong principle of inheritance, any selected variety will tend to propagate its new and modified form.” ...
Evolution and variation - Anoka
... • Fitness: A phenotype with greater fitness usually increases in frequency – Most fit is given a value of 1 • Fitness is a combination of: – Survival: how long does an organism live – Mating success: how often it mates – Number of offspring per mating that survive ...
... • Fitness: A phenotype with greater fitness usually increases in frequency – Most fit is given a value of 1 • Fitness is a combination of: – Survival: how long does an organism live – Mating success: how often it mates – Number of offspring per mating that survive ...
Chapter 15 Outline
... -Use and disuse -Inheritance of acquired traits -How was LaMark incorrect ...
... -Use and disuse -Inheritance of acquired traits -How was LaMark incorrect ...
NaturalSelectionProtocol
... READ: Evolution by natural selection leads to adaptation within a population. The term evolution by natural selection does not refer to individuals changing, only to changes in the frequency of adaptive characteristics in the population as a whole. For example, for the mice that lived in the beach a ...
... READ: Evolution by natural selection leads to adaptation within a population. The term evolution by natural selection does not refer to individuals changing, only to changes in the frequency of adaptive characteristics in the population as a whole. For example, for the mice that lived in the beach a ...
Biol-1406_Ch14.ppt
... • 2: At least some of the differences among members of a population are due to characteristics that may be passed from parent to offspring – However, the mechanism of inheritance was not understood at this point in time ...
... • 2: At least some of the differences among members of a population are due to characteristics that may be passed from parent to offspring – However, the mechanism of inheritance was not understood at this point in time ...
Early Earth and Evolution
... • Due to the genetic variation in a species, there is phenotypic variation. • Due to competition, those organisms that have traits which give them a slight advantage over others will survive while those organisms with deleterious traits will die-off Fitness: ability to survive and pass on ones genes ...
... • Due to the genetic variation in a species, there is phenotypic variation. • Due to competition, those organisms that have traits which give them a slight advantage over others will survive while those organisms with deleterious traits will die-off Fitness: ability to survive and pass on ones genes ...
Modern Evolutionary Theory
... How is the Modern Theory of Evolution different from Darwin’s? What does “adaptive value” mean? What are two causes of variation? Define segregation. Define recombination. ...
... How is the Modern Theory of Evolution different from Darwin’s? What does “adaptive value” mean? What are two causes of variation? Define segregation. Define recombination. ...
Natural selection
Natural selection is the differential survival and reproduction of individuals due to differences in phenotype; it is a key mechanism of evolution. The term ""natural selection"" was popularised by Charles Darwin, who intended it to be compared with artificial selection, now more commonly referred to as selective breeding.Variation exists within all populations of organisms. This occurs partly because random mutations arise in the genome of an individual organism, and these mutations can be passed to offspring. Throughout the individuals’ lives, their genomes interact with their environments to cause variations in traits. (The environment of a genome includes the molecular biology in the cell, other cells, other individuals, populations, species, as well as the abiotic environment.) Individuals with certain variants of the trait may survive and reproduce more than individuals with other, less successful, variants. Therefore, the population evolves. Factors that affect reproductive success are also important, an issue that Darwin developed in his ideas on sexual selection, which was redefined as being included in natural selection in the 1930s when biologists considered it not to be very important, and fecundity selection, for example.Natural selection acts on the phenotype, or the observable characteristics of an organism, but the genetic (heritable) basis of any phenotype that gives a reproductive advantage may become more common in a population (see allele frequency). Over time, this process can result in populations that specialise for particular ecological niches (microevolution) and may eventually result in the emergence of new species (macroevolution). In other words, natural selection is an important process (though not the only process) by which evolution takes place within a population of organisms. Natural selection can be contrasted with artificial selection, in which humans intentionally choose specific traits (although they may not always get what they want). In natural selection there is no intentional choice. In other words, artificial selection is teleological and natural selection is not teleological.Natural selection is one of the cornerstones of modern biology. The concept was published by Darwin and Alfred Russel Wallace in a joint presentation of papers in 1858, and set out in Darwin's influential 1859 book On the Origin of Species, in which natural selection was described as analogous to artificial selection, a process by which animals and plants with traits considered desirable by human breeders are systematically favoured for reproduction. The concept of natural selection was originally developed in the absence of a valid theory of heredity; at the time of Darwin's writing, nothing was known of modern genetics. The union of traditional Darwinian evolution with subsequent discoveries in classical and molecular genetics is termed the modern evolutionary synthesis. Natural selection remains the primary explanation for adaptive evolution.