Evolution and Speciation
... Also arise in response to environmental pressures ◦ Temperature, Antibiotic/pesticide resistance ...
... Also arise in response to environmental pressures ◦ Temperature, Antibiotic/pesticide resistance ...
Speciation
... 5) ___________ barriers develop Final stage of __________ Prohibits successful _______ across subpopulations ...
... 5) ___________ barriers develop Final stage of __________ Prohibits successful _______ across subpopulations ...
Macroevolution
... • Allopolyploidy - Parents that belong to different species produce offspring in which chromosome number doubles ...
... • Allopolyploidy - Parents that belong to different species produce offspring in which chromosome number doubles ...
Population Genetics, Speciation, and Classification
... • Allopatric speciation- happens when species arise as a result of geogrphic isolation • Allopatric=“different homelands” ...
... • Allopatric speciation- happens when species arise as a result of geogrphic isolation • Allopatric=“different homelands” ...
Mixture Models in Statistics: Given a sample Xi for 1 ≤ i ≤ n , can it
... THE MODEL: A probability model leads to 3 parameters at each locus, specifically one parameter γi for selection and two mutation rates θsi and θri . Mutations at the ith locus have selection coefficients s that are normal N (γi , σw ). Mutants with s on the upper tail of this distribution control ev ...
... THE MODEL: A probability model leads to 3 parameters at each locus, specifically one parameter γi for selection and two mutation rates θsi and θri . Mutations at the ith locus have selection coefficients s that are normal N (γi , σw ). Mutants with s on the upper tail of this distribution control ev ...
Natural selection
... Organisms produce more offspring than can survive, and many that do survive do not reproduce Because more organisms are produced than can survive, they compete for limited resources Each unique organism has different advantages and disadvantages in the struggle for existence. Individuals best suited ...
... Organisms produce more offspring than can survive, and many that do survive do not reproduce Because more organisms are produced than can survive, they compete for limited resources Each unique organism has different advantages and disadvantages in the struggle for existence. Individuals best suited ...
Species Interaction
... (1) that the presence of absence of a species could be determined by competition with other species; (2) that conditions of the environment (in this case, soil type) affected the outcome of competition; (3) that competition might be felt very broadly at first (i.e., from other vegetation throughout ...
... (1) that the presence of absence of a species could be determined by competition with other species; (2) that conditions of the environment (in this case, soil type) affected the outcome of competition; (3) that competition might be felt very broadly at first (i.e., from other vegetation throughout ...
Review Sheet Key - Spring Branch ISD
... All life descended from one common ancestor, but many branches developed from that common ancestor over time 7. What does the theory of Natural selection state? There will be competition within a species for resources and the fittest or best adapted organisms will survive to reproduce and pass on th ...
... All life descended from one common ancestor, but many branches developed from that common ancestor over time 7. What does the theory of Natural selection state? There will be competition within a species for resources and the fittest or best adapted organisms will survive to reproduce and pass on th ...
Evolution Guided Reading
... 32. ____________________________, the process of forming new species, results in closely related species AT THE BEGINNING. However, over time, species can become quite ______________________________. 33. ____________________________ is the external appearance of an organism. 34. What is a problem wi ...
... 32. ____________________________, the process of forming new species, results in closely related species AT THE BEGINNING. However, over time, species can become quite ______________________________. 33. ____________________________ is the external appearance of an organism. 34. What is a problem wi ...
Speciation
... population does not mate randomly Individuals are more likely to mate with their geographic neighbors than with individuals in a different part of the population’s range ...
... population does not mate randomly Individuals are more likely to mate with their geographic neighbors than with individuals in a different part of the population’s range ...
Species distribution
Species distribution is the manner in which a biological taxon is spatially arranged. Species distribution is not to be confused with dispersal, which is the movement of individuals away from their area of origin or from centers of high population density. A similar concept is the species range. A species range is often represented with a species range map. Biogeographers try to understand the factors determining a species' distribution. The pattern of distribution is not permanent for each species. Distribution patterns can change seasonally, in response to the availability of resources, and also depending on the scale at which they are viewed. Dispersion usually takes place at the time of reproduction. Populations within a species are translocated through many methods, including dispersal by people, wind, water and animals. Humans are one of the largest distributors due to the current trends in globalization and the expanse of the transportation industry. For example, large tankers often fill their ballasts with water at one port and empty them in another, causing a wider distribution of aquatic species.Biogeography is the study of the distribution of biodiversity over space and time. It is very useful in understanding species distribution through factors such as speciation, extinction, continental drift, glaciation, variation of sea levels, river capture and available resources. This branch of study not only gives a description of the species distribution, but also a geographical explanation for the distribution of particular species. The traditional biogeographic regions were first modeled by Alfred Wallace in The Geographical Distribution of Animals (1876). These were based on the work of Sclater's terrestrial biogeographic regions. Wallace's system was based on both birds and vertebrates, including non-flying mammals, which better reflect the natural divisions of the Earth due to their limited dispersal abilities.