PREZYGOTIC BARRIERS - Speedway High School
... closely related species becoming more different in response to changes in environment EX: Darwin’s finches and tortoises on Galapagos CONVERGENT EVOLUTION Unrelated species becoming more alike because they live in same type of environment EX: Whales (mammals), penguins (birds), and sharks (fish) all ...
... closely related species becoming more different in response to changes in environment EX: Darwin’s finches and tortoises on Galapagos CONVERGENT EVOLUTION Unrelated species becoming more alike because they live in same type of environment EX: Whales (mammals), penguins (birds), and sharks (fish) all ...
Chapter 22 Concepts Key
... those species had a common ancestor. The classic example is the forelimb of mammals. All mammals share a common arrangement of bones from their shoulder region to the tips of their digits. The basic structure is all the same whether you are a human or a whale so the theory is some common ancestor ha ...
... those species had a common ancestor. The classic example is the forelimb of mammals. All mammals share a common arrangement of bones from their shoulder region to the tips of their digits. The basic structure is all the same whether you are a human or a whale so the theory is some common ancestor ha ...
Evolution
... Darwin’s Theory of Natural Selection Through his travels to SA and Galapagos Islands, collecting and observing different species By reading the works of other scientists who ...
... Darwin’s Theory of Natural Selection Through his travels to SA and Galapagos Islands, collecting and observing different species By reading the works of other scientists who ...
Evolution
... other resources are limited, so offspring must compete with each other to survive. ...
... other resources are limited, so offspring must compete with each other to survive. ...
Darwin`s Voyage
... a. Some organisms are more suited to their environment as a result of variations in the species. b. ________________: the ability of an individual to ___________ and ______________________ in its specific environment. Fitness is a result of ________________. c. Individuals that are fit to their env ...
... a. Some organisms are more suited to their environment as a result of variations in the species. b. ________________: the ability of an individual to ___________ and ______________________ in its specific environment. Fitness is a result of ________________. c. Individuals that are fit to their env ...
File
... Reproductive Isolation: Occurs when members of different populations can no longer successfully mate. Can occur because of something physical or because the offspring can’t survive and reproduce. This is the final step in a species splitting into 2 different species. Speciation: This is the rise of ...
... Reproductive Isolation: Occurs when members of different populations can no longer successfully mate. Can occur because of something physical or because the offspring can’t survive and reproduce. This is the final step in a species splitting into 2 different species. Speciation: This is the rise of ...
Evidence of Evolution - Yorkville High School
... The Fossil Record • Found fossils that show slow progression of change • More found since Darwin ...
... The Fossil Record • Found fossils that show slow progression of change • More found since Darwin ...
File - Tabb Life Science
... Species - a group of organisms that are closely related and can mate to produce fertile offspring Evolution - the process in which inherited characteristics within a population change over generations such that new species sometimes arise Fossil - the remains or physical evidence of an organism pres ...
... Species - a group of organisms that are closely related and can mate to produce fertile offspring Evolution - the process in which inherited characteristics within a population change over generations such that new species sometimes arise Fossil - the remains or physical evidence of an organism pres ...
What was Darwin`s explanation for evolution?
... Movie: Elements of biology: agents of evolution ...
... Movie: Elements of biology: agents of evolution ...
What was Darwin`s explanation for evolution?
... Movie: Elements of biology: agents of evolution ...
... Movie: Elements of biology: agents of evolution ...
Evolution Review answers
... 1. What two scientists first proposed that the Earth was much older than we initially thought? What evidence did they use to make this determination? Thomas Hutton and Charles Lyell. They looked at the stratified nature of certain rocks. Each layer represented a very long period of time. 2. What pre ...
... 1. What two scientists first proposed that the Earth was much older than we initially thought? What evidence did they use to make this determination? Thomas Hutton and Charles Lyell. They looked at the stratified nature of certain rocks. Each layer represented a very long period of time. 2. What pre ...
Changes Over Time
... Natural Selection • the survival and reproduction of the individuals in a population that exhibit the traits that best enable them to survive in their environment. • The Survival of the Fittest ...
... Natural Selection • the survival and reproduction of the individuals in a population that exhibit the traits that best enable them to survive in their environment. • The Survival of the Fittest ...
File
... Uniformitarianism = Earth’s processes same rate in past & present therefore Earth is very old Slow & subtle changes in organisms big change James Hutton ...
... Uniformitarianism = Earth’s processes same rate in past & present therefore Earth is very old Slow & subtle changes in organisms big change James Hutton ...
Chapters 2 and 3
... Younger rocks on top of older ones Originally in horizontal position Rocks that intrude into seams are younger Boulders, cobbles are older than the host rock Earlier fossil life forms are simpler, more recent are most similar to extant forms. ...
... Younger rocks on top of older ones Originally in horizontal position Rocks that intrude into seams are younger Boulders, cobbles are older than the host rock Earlier fossil life forms are simpler, more recent are most similar to extant forms. ...
Evolution - Jessamine County Schools
... – By natural selection – explains how life changes over time – Adaptation or adaptive traits enables an organism to survive through natural selection to reproduce under prevailing environmental conditions. – Biological evolution is based on changes in a population’s genetic makeup over time. – Popul ...
... – By natural selection – explains how life changes over time – Adaptation or adaptive traits enables an organism to survive through natural selection to reproduce under prevailing environmental conditions. – Biological evolution is based on changes in a population’s genetic makeup over time. – Popul ...
FRQs (will be Evolution Only)
... In a laboratory population of diploid, sexually reproducing organisms a certain trait is determined by a single autosomal gene and is expressed as two phenotypes. A new population ...
... In a laboratory population of diploid, sexually reproducing organisms a certain trait is determined by a single autosomal gene and is expressed as two phenotypes. A new population ...
Scientific Contribution to a Theory of Evolution
... 1. Flora and fauna of the different regions were distinct from those in Europe. • Example: rodents in South America were structurally similar to one another, but different from other continents ...
... 1. Flora and fauna of the different regions were distinct from those in Europe. • Example: rodents in South America were structurally similar to one another, but different from other continents ...
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 ____________ ...
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.