Slide 1
... Natural Selection shapes a population, making it adapted to its current environment. This happens over a relatively short period of time. Most scientists agree that natural selection, acting over very long periods of time, leads to speciation. (“Adding branches to the tree.”) There are two patterns ...
... Natural Selection shapes a population, making it adapted to its current environment. This happens over a relatively short period of time. Most scientists agree that natural selection, acting over very long periods of time, leads to speciation. (“Adding branches to the tree.”) There are two patterns ...
Early Ideas About Evolution
... Proposed theory called Actualism It states that the same geological processes occurring in the present also occurred in the past – this is an essential principle of Uniformitarianism Sir Charles Lyell (1797-1875) Built on Hutton’s ideas He was a British geologist Published the first volume ...
... Proposed theory called Actualism It states that the same geological processes occurring in the present also occurred in the past – this is an essential principle of Uniformitarianism Sir Charles Lyell (1797-1875) Built on Hutton’s ideas He was a British geologist Published the first volume ...
document
... 1830 First volume of Charles Lyell's Principles of Geology interprets earth history as a process of gradual change. Lyell felt that geological processes are so uniform that their rates and effects must balance out through time. Processes that build mountains must eventually be balanced by the erosio ...
... 1830 First volume of Charles Lyell's Principles of Geology interprets earth history as a process of gradual change. Lyell felt that geological processes are so uniform that their rates and effects must balance out through time. Processes that build mountains must eventually be balanced by the erosio ...
Name Date ______ Chapter 22: Descent with Modification: A
... 10. It is important to remember that differences in heritable traits can lead to differential reproductive success. This means that the individuals who have the necessary traits to promote survival in the current environment will leave the most offspring. What can this differential reproductive succ ...
... 10. It is important to remember that differences in heritable traits can lead to differential reproductive success. This means that the individuals who have the necessary traits to promote survival in the current environment will leave the most offspring. What can this differential reproductive succ ...
Evolution as Fact and Theory What is a Scientific Theory? Examples
... Malthus’ essay) that all species have the capacity to achieve huge population sizes through reproduction, but that at some point, resources would become limiting setting up a struggle for existence. ...
... Malthus’ essay) that all species have the capacity to achieve huge population sizes through reproduction, but that at some point, resources would become limiting setting up a struggle for existence. ...
... Diagram A illustrates one view of the rate of evolution. It shows a branching of an evolutionary path, from a common ancestor, and the gradual emergence of one or more new, different species. The gradual slope of the branches indicates that many intermediate forms of the organism are believed to hav ...
AP Biology Ch 19 notes
... - belief that evolution explains life’s unity and diversity - belief that natural selection is the cause of adaptive evolution ...
... - belief that evolution explains life’s unity and diversity - belief that natural selection is the cause of adaptive evolution ...
Descent with Modification
... Evolution does not create novel life forms Nature selects from existing variants ...
... Evolution does not create novel life forms Nature selects from existing variants ...
Evolution Test
... D. A diagram that does not show evolutionary relationships 9. A mechanism for change in populations where an organism with a favorable phenotype survives, reproduces, and passes the favorable phenotype to the next generation. Organisms without the favorable phenotype are less likely to survive and r ...
... D. A diagram that does not show evolutionary relationships 9. A mechanism for change in populations where an organism with a favorable phenotype survives, reproduces, and passes the favorable phenotype to the next generation. Organisms without the favorable phenotype are less likely to survive and r ...
Choose the correct answer:
... without spreading. They are exposed to small mutations and variations at successive generations. The accumulation of these characters leads to the appearance of new species. ...
... without spreading. They are exposed to small mutations and variations at successive generations. The accumulation of these characters leads to the appearance of new species. ...
Unit 5: Evolution through Natural Selection and other
... individuals will survive and reproduce more successfully than others in their current environment. ...
... individuals will survive and reproduce more successfully than others in their current environment. ...
Ch. I Introduction
... divergent populations will gradually develop until, eventually, genetically divergent populations become reproductively isolated from each other. - At this point a new species has been formed. Speciation results from adaptive changes in different environments accompanied by reproductive isolation. - ...
... divergent populations will gradually develop until, eventually, genetically divergent populations become reproductively isolated from each other. - At this point a new species has been formed. Speciation results from adaptive changes in different environments accompanied by reproductive isolation. - ...
NOTES Ch. 15 Evolution
... How does natural selection alter phenotypes: 1. Stabilizing Selection – eliminates extremes, favors average 2. Directional Selection – one extreme is favored (peppered moth) 3. Disruptive Selection – removes average traits, favors both extremes ...
... How does natural selection alter phenotypes: 1. Stabilizing Selection – eliminates extremes, favors average 2. Directional Selection – one extreme is favored (peppered moth) 3. Disruptive Selection – removes average traits, favors both extremes ...
Evolution
... • Morphological (appearance) observations suggest three species • Molecular analysis via RAPID study supports morphological species distinction ...
... • Morphological (appearance) observations suggest three species • Molecular analysis via RAPID study supports morphological species distinction ...
Speciation
... • Morphological (appearance) observations suggest three species • Molecular analysis via RAPID study supports morphological species distinction ...
... • Morphological (appearance) observations suggest three species • Molecular analysis via RAPID study supports morphological species distinction ...
Bio Crash Course
... – Natural selection acts to preserve and accumulate minor advantageous genetic mutations. Suppose a member of a species developed a functional advantage (it grew wings and learned to fly). Its offspring would inherit that advantage and pass it on to their offspring. The inferior (disadvantaged) memb ...
... – Natural selection acts to preserve and accumulate minor advantageous genetic mutations. Suppose a member of a species developed a functional advantage (it grew wings and learned to fly). Its offspring would inherit that advantage and pass it on to their offspring. The inferior (disadvantaged) memb ...
E9 Natural selection and geographical isolation can lead to speciation
... Separation then isolates the gene flow from one group to another Changes can accumulate in each isolated group due to different selective pressures (different abiotic/biotic factors) Genetic differences accumulate Gives rise then to reproductive isolation No more gene flow- over time a new ...
... Separation then isolates the gene flow from one group to another Changes can accumulate in each isolated group due to different selective pressures (different abiotic/biotic factors) Genetic differences accumulate Gives rise then to reproductive isolation No more gene flow- over time a new ...
Darwin and Evolution - Mamanakis
... • The concept that the shuffling of genes that occur during sexual reproduction, by itself, cannot change the overall genetic makeup of a population. ...
... • The concept that the shuffling of genes that occur during sexual reproduction, by itself, cannot change the overall genetic makeup of a population. ...
Evolution of Populations and Speciation
... • Anteaters feed by breaking open termite nests, extending their sticky tongue into the nest and lapping up termites. Suppose that an area was invaded by a new specise of termite that built very deep nests. Anteaters with long tongues could more effectively prey on the termites. What would the popu ...
... • Anteaters feed by breaking open termite nests, extending their sticky tongue into the nest and lapping up termites. Suppose that an area was invaded by a new specise of termite that built very deep nests. Anteaters with long tongues could more effectively prey on the termites. What would the popu ...
Evolution
... Allopatric Speciation: a process thought to have been responsible for a great many species formation; when an ancestral population becomes segregated by a geographic barrier or is divided into 2 populations geographically (Geographical fragmentation important- 1) moving to new environments, 2) geogr ...
... Allopatric Speciation: a process thought to have been responsible for a great many species formation; when an ancestral population becomes segregated by a geographic barrier or is divided into 2 populations geographically (Geographical fragmentation important- 1) moving to new environments, 2) geogr ...
Evolution Notes
... Natural Selection is not always at work! Certain conditions have to be met for natural selection to occur in a population The trait must be heritable Overproduction of offspring-more babies born than what the environment can support Variation-some individuals have the trait, some don’t ...
... Natural Selection is not always at work! Certain conditions have to be met for natural selection to occur in a population The trait must be heritable Overproduction of offspring-more babies born than what the environment can support Variation-some individuals have the trait, some don’t ...
Punctuated equilibrium
Punctuated equilibrium (also called punctuated equilibria) is a theory in evolutionary biology which proposes that once species appear in the fossil record they will become stable, showing little net evolutionary change for most of their geological history. This state is called stasis. When significant evolutionary change occurs, the theory proposes that it is generally restricted to rare and geologically rapid events of branching speciation called cladogenesis. Cladogenesis is the process by which a species splits into two distinct species, rather than one species gradually transforming into another. Punctuated equilibrium is commonly contrasted against phyletic gradualism, the belief that evolution generally occurs uniformly and by the steady and gradual transformation of whole lineages (called anagenesis). In this view, evolution is seen as generally smooth and continuous.In 1972, paleontologists Niles Eldredge and Stephen Jay Gould published a landmark paper developing their theory and called it punctuated equilibria. Their paper built upon Ernst Mayr's model of geographic speciation, I. Michael Lerner's theories of developmental and genetic homeostasis, as well as their own empirical research. Eldredge and Gould proposed that the degree of gradualism commonly attributed to Charles Darwin is virtually nonexistent in the fossil record, and that stasis dominates the history of most fossil species.