Isolation and the Evolution of New Species - BioGeoWiki
... • Any population of living organisms contain genetic variation. • If one population becomes isolated they will probably be living in different conditions. ...
... • Any population of living organisms contain genetic variation. • If one population becomes isolated they will probably be living in different conditions. ...
Evolution Processes
... Species: a group of populations whose individuals have the potential to interbreed and produce fertile offspring Gene pool: the total aggregate of genes in a population at any one time Population genetics: the study of genetic changes in populations “Individuals are selected, but populations ...
... Species: a group of populations whose individuals have the potential to interbreed and produce fertile offspring Gene pool: the total aggregate of genes in a population at any one time Population genetics: the study of genetic changes in populations “Individuals are selected, but populations ...
The Diversity of Species
... Post-reproductive isolating mechanisms • Summarise the three types of postreproductive isolating mechanisms • Explain why hybrid sterility is not a barrier in plants as it is in animals. ...
... Post-reproductive isolating mechanisms • Summarise the three types of postreproductive isolating mechanisms • Explain why hybrid sterility is not a barrier in plants as it is in animals. ...
Natural Selection and Genetics of Species
... • Speciation in the Galapagos finches occurred by: – Founding a new population – Geographic isolation which led to reproductive isolation and changes in the gene pool due to competition for food ...
... • Speciation in the Galapagos finches occurred by: – Founding a new population – Geographic isolation which led to reproductive isolation and changes in the gene pool due to competition for food ...
Core questions
... a. one species geographic isolation divergent evolution reproductive isolation two species b. one species reproductive isolation divergent evolution geographic isolation two species c. one species divergent evolution geographic isolation reproductive isolation two species d. ...
... a. one species geographic isolation divergent evolution reproductive isolation two species b. one species reproductive isolation divergent evolution geographic isolation two species c. one species divergent evolution geographic isolation reproductive isolation two species d. ...
15.1: New Species Evolve
... Reproductive Isolation: Condition that keeps 2 species from interbreeding 1. Timing Issues: 2 species have diff. Breeding seasons 2. Behavior: Different courtship or mating behaviors 3. Habitat: Surface water v. deep water 4. Not anatomically compatable ...
... Reproductive Isolation: Condition that keeps 2 species from interbreeding 1. Timing Issues: 2 species have diff. Breeding seasons 2. Behavior: Different courtship or mating behaviors 3. Habitat: Surface water v. deep water 4. Not anatomically compatable ...
Evolution brain mapping review for test (aka “big ideas”) With your
... With your team, you will be taking the following ideas and creating a concept map (using post-it notes) to link the ideas together in a way that makes sense for you and your team mates. Link each concept to others using toothpicks. You may use each term/idea more than once. Simply make more than one ...
... With your team, you will be taking the following ideas and creating a concept map (using post-it notes) to link the ideas together in a way that makes sense for you and your team mates. Link each concept to others using toothpicks. You may use each term/idea more than once. Simply make more than one ...
•The Earth has millions of organisms that display different
... isolated from each other. When the members of two populations cannot interbreed and produce fertile offspring, reproductive isolation has occurred. The sharks above are related but unable to mate and produce offspring therefore they are members of two different species. Reproductive isolation can de ...
... isolated from each other. When the members of two populations cannot interbreed and produce fertile offspring, reproductive isolation has occurred. The sharks above are related but unable to mate and produce offspring therefore they are members of two different species. Reproductive isolation can de ...
Chapter 22 Active Reading Guide The Origin of Species
... Sea urchins species differ in the protein receptors on the egg that will bind the sperm; plant stigmas have specific receptors only to the pollen of the same species. ...
... Sea urchins species differ in the protein receptors on the egg that will bind the sperm; plant stigmas have specific receptors only to the pollen of the same species. ...
The Environmental Scientist
... royal antelope (deer) each is small, brown – live in tropical rainforest Also Auk (north pole) and penguin (south pole) ...
... royal antelope (deer) each is small, brown – live in tropical rainforest Also Auk (north pole) and penguin (south pole) ...
sympatric speciation
... - isolated pops. gradually diverge; genetic diffs. develop due to selection in diff. environments, genetic drift, or founder effect - when & if pops. make contact isolating mechanisms may be reinforced (hybrids selected against) ...
... - isolated pops. gradually diverge; genetic diffs. develop due to selection in diff. environments, genetic drift, or founder effect - when & if pops. make contact isolating mechanisms may be reinforced (hybrids selected against) ...
Lecture #11 Date
... 2. Postzygotic barriers: fertilization occurs, but the hybrid zygote does not develop into a viable, fertile adult • Reduced hybrid viability (frogs; zygotes fail to develop or reach sexual maturity) • Reduced hybrid fertility (mule; horse x donkey; cannot backbreed) • Hybrid breakdown (cotton; 2nd ...
... 2. Postzygotic barriers: fertilization occurs, but the hybrid zygote does not develop into a viable, fertile adult • Reduced hybrid viability (frogs; zygotes fail to develop or reach sexual maturity) • Reduced hybrid fertility (mule; horse x donkey; cannot backbreed) • Hybrid breakdown (cotton; 2nd ...
preview images for j..
... Spatial, temporal, mechanical and gametic isolation •Postzygotic Barriers; reproductive isolating mechanisms that operate after fertilization •Problems with hybrids – including developmental abnormalities, infertility and low viability •In “hybrid zones” or “areas of secondary contact” where hybridi ...
... Spatial, temporal, mechanical and gametic isolation •Postzygotic Barriers; reproductive isolating mechanisms that operate after fertilization •Problems with hybrids – including developmental abnormalities, infertility and low viability •In “hybrid zones” or “areas of secondary contact” where hybridi ...
IV. Natural Selection
... 1. Populations adapt to their environment or random changes may occur in separate populations. 2. Adaptation or random changes result in the accumulation of many differences between the populations. 3. Isolating mechanisms prevent population hybridization. 4. The populations are no longer capable of ...
... 1. Populations adapt to their environment or random changes may occur in separate populations. 2. Adaptation or random changes result in the accumulation of many differences between the populations. 3. Isolating mechanisms prevent population hybridization. 4. The populations are no longer capable of ...
1) Geographic Isolation
... • Defined: evolution of a new species • Species: group of organisms that can interbreed and produce fertile offspring • Isolation reduces gene flow – Reproductive – Geographical – Behavioral – Temporal • Gene pools & frequencies altered ...
... • Defined: evolution of a new species • Species: group of organisms that can interbreed and produce fertile offspring • Isolation reduces gene flow – Reproductive – Geographical – Behavioral – Temporal • Gene pools & frequencies altered ...
Mechanisms of Evolution Notes
... • Species – organisms that look alike can interbreed to produce fertile offspring • Speciation – evolution of a new species. • Organisms within the same species have reproductive success ( ability to pass genes onto the next generation in a way that they too can pass on those genes.) ...
... • Species – organisms that look alike can interbreed to produce fertile offspring • Speciation – evolution of a new species. • Organisms within the same species have reproductive success ( ability to pass genes onto the next generation in a way that they too can pass on those genes.) ...
Population Genetics 2
... - cross between a male lion and a female tiger - Hobbs is a sterile male - challenges geographic isolation because interbreeding between species, BUT ligers are typically sterile therefore this is ‘unsuccessful breeding’ ...
... - cross between a male lion and a female tiger - Hobbs is a sterile male - challenges geographic isolation because interbreeding between species, BUT ligers are typically sterile therefore this is ‘unsuccessful breeding’ ...
Speciation - Mrs. Cardoza Biology
... Speciation is the formation of a new species. Species is defined as organisms that are physically similar and can produce fertile offspring. Changes in gene frequencies that lead to the development of a new species are more likely to occur in small populations than in large ones. Small groups may be ...
... Speciation is the formation of a new species. Species is defined as organisms that are physically similar and can produce fertile offspring. Changes in gene frequencies that lead to the development of a new species are more likely to occur in small populations than in large ones. Small groups may be ...
adaptation adaptive radiation analogous structure artificial selection
... Any inherited characteristic that increases an organism’s chance for survival. A single species evolves into different forms due to natural selection and various forms of isolation. Structures with similar functions that did not come from a common ancestry, but from sharing a similar environment. Se ...
... Any inherited characteristic that increases an organism’s chance for survival. A single species evolves into different forms due to natural selection and various forms of isolation. Structures with similar functions that did not come from a common ancestry, but from sharing a similar environment. Se ...
What was Darwin`s explanation for evolution?
... 1) Gradualism – evolution occurs steadily through time (Slow & Continuous) . 2) Punctuated Equilibrium- species stay the same for long periods of time and then change ...
... 1) Gradualism – evolution occurs steadily through time (Slow & Continuous) . 2) Punctuated Equilibrium- species stay the same for long periods of time and then change ...
Chapter 15- Plant Evolution
... Grass in the foreground is growing on mine tailings The same species is growing in the background ...
... Grass in the foreground is growing on mine tailings The same species is growing in the background ...
Notes
... reproductive, or filling different ecological niches to reduce competition •With isolation comes changing environmental factors exerting selective pressure on mutations and adaptations. ...
... reproductive, or filling different ecological niches to reduce competition •With isolation comes changing environmental factors exerting selective pressure on mutations and adaptations. ...
Sympatric Speciation
... “Origin of Species” only adaptation, or the beginning of speciation. We must begin with the question “What is a species?”. i.e. When do gene/allele frequencies in a population change enough to result in a new species? ...
... “Origin of Species” only adaptation, or the beginning of speciation. We must begin with the question “What is a species?”. i.e. When do gene/allele frequencies in a population change enough to result in a new species? ...
Patterns of Evolution
... The species concept itself is difficult and not absolute. A common definition would be "a group of closely related interbreeding individuals producing fertile offspring under natural conditions." This excludes the majority of all life - the asexually-reproducing bacteria, archaea, and most of the un ...
... The species concept itself is difficult and not absolute. A common definition would be "a group of closely related interbreeding individuals producing fertile offspring under natural conditions." This excludes the majority of all life - the asexually-reproducing bacteria, archaea, and most of the un ...