Ch 15 Notes Teacher
... Reproductive Isolation: Prezygotic isolation & Postzygotic isolation • Hybrid offspring either cannot develop or cannot reproduce. Speciation: Allopatric and Sympatric speciation • For speciation to occur, populations must diverge and become reproductively isolated. • Two types of speciation: allop ...
... Reproductive Isolation: Prezygotic isolation & Postzygotic isolation • Hybrid offspring either cannot develop or cannot reproduce. Speciation: Allopatric and Sympatric speciation • For speciation to occur, populations must diverge and become reproductively isolated. • Two types of speciation: allop ...
The Origin of Life: How? When? Where?
... actually or potentially interbreeding populations, which are reproductively isolated from other such groups (Ernst Mayr, 1942); emphasizes reproductive isolation (lack of gene flow); later modified to account for existence of fertile animal hybrids (animal hybrids are rare, and are typically sterile ...
... actually or potentially interbreeding populations, which are reproductively isolated from other such groups (Ernst Mayr, 1942); emphasizes reproductive isolation (lack of gene flow); later modified to account for existence of fertile animal hybrids (animal hybrids are rare, and are typically sterile ...
Species and Speciation
... into many different forms A single parent species is put under (at least) 2 different selective pressures. With time, 2 or more related species will develop and become more and more dissimilar as they adapt to their environment ...
... into many different forms A single parent species is put under (at least) 2 different selective pressures. With time, 2 or more related species will develop and become more and more dissimilar as they adapt to their environment ...
B. directional selection.
... and produce fertile offspring. This is a prerequisite for speciation.___________________________________________ ____________________________________________________ 15. What is Genetic Drift? In what kinds of situations is it likely to occur? (K) Genetic Drift is a random change in allele frequency ...
... and produce fertile offspring. This is a prerequisite for speciation.___________________________________________ ____________________________________________________ 15. What is Genetic Drift? In what kinds of situations is it likely to occur? (K) Genetic Drift is a random change in allele frequency ...
Name: Class: Date: The Evolution of Populations Vocabulary
... separated due to differences in courtship or mating rituals 8. Species from two populations are separated due to differences in the timing of their reproduction ...
... separated due to differences in courtship or mating rituals 8. Species from two populations are separated due to differences in the timing of their reproduction ...
Exam 5 Q3 Review Sheet 3/28/11
... assumption and how does assuming this help us in life? 34. Be able to do the Hardy-Weinberg problems. There is a practice sheet online. There will certainly be a problem or two. 35. Describe what is meant by a polymorphism and give examples. 36. Describe what is meant by a cline and give examples. 3 ...
... assumption and how does assuming this help us in life? 34. Be able to do the Hardy-Weinberg problems. There is a practice sheet online. There will certainly be a problem or two. 35. Describe what is meant by a polymorphism and give examples. 36. Describe what is meant by a cline and give examples. 3 ...
Organic Evolution
... Differentiate between micro and macroevolution. Write the Hardy-Weinberg formulas and explain each term in the equations. Use the Hardy-Weinberg formulas to determine allele, genotype and phenotype frequencies in populations. List the 5 assumptions of the Hardy-Weinberg equilibrium. Give 5 ...
... Differentiate between micro and macroevolution. Write the Hardy-Weinberg formulas and explain each term in the equations. Use the Hardy-Weinberg formulas to determine allele, genotype and phenotype frequencies in populations. List the 5 assumptions of the Hardy-Weinberg equilibrium. Give 5 ...
3 Natural Selection in Action
... Hunting is one of the factors that can affect the survival of animals. In Africa, people hunt male elephants for their tusks, which are made of ivory. Because of natural genetic variations, some male elephants do not grow tusks. People do not hunt these tuskless elephants, so tuskless elephants tend ...
... Hunting is one of the factors that can affect the survival of animals. In Africa, people hunt male elephants for their tusks, which are made of ivory. Because of natural genetic variations, some male elephants do not grow tusks. People do not hunt these tuskless elephants, so tuskless elephants tend ...
Page 1 of 18 TOPIC: DIVERSITY: EVOLUTION BY NATURAL
... Reproductive isolation result because of: o Behavioural isolation: animals behave differently during mating rituals - females are not responsive, so no mating takes place. o Gamete isolation: when genes change, gametes become chemically altered, so fusion of the gametes is impossible. Should the gam ...
... Reproductive isolation result because of: o Behavioural isolation: animals behave differently during mating rituals - females are not responsive, so no mating takes place. o Gamete isolation: when genes change, gametes become chemically altered, so fusion of the gametes is impossible. Should the gam ...
The origin of species
... Peter and Rosemary Grant • Studied finches on the Galapagos for 30 years • Observed the evolution of a new species of finch through natural selection • Showed that evolution can happen both rapidly and slowly depending on environmental stresses Copyright © 2003 Pearson Education, Inc. publishing as ...
... Peter and Rosemary Grant • Studied finches on the Galapagos for 30 years • Observed the evolution of a new species of finch through natural selection • Showed that evolution can happen both rapidly and slowly depending on environmental stresses Copyright © 2003 Pearson Education, Inc. publishing as ...
16.3 Evolution - MsPittsBiologySpace
... The Grants first identified and measured as many individual birds as possible on the island. They recorded which birds were still living and which had died, which had succeeded in breeding and which had not. For each individual, they also recorded anatomical characteristics such as wing length, leg ...
... The Grants first identified and measured as many individual birds as possible on the island. They recorded which birds were still living and which had died, which had succeeded in breeding and which had not. For each individual, they also recorded anatomical characteristics such as wing length, leg ...
Evolution
... Speciation has already been described. ‘Extinction’ is clearly a major feature of evolution. Although a few species have apparently persisted for very long times in relatively stable environments, such as the depths of the ocean, most species of animals and plants (~99%) have appeared in the fossil ...
... Speciation has already been described. ‘Extinction’ is clearly a major feature of evolution. Although a few species have apparently persisted for very long times in relatively stable environments, such as the depths of the ocean, most species of animals and plants (~99%) have appeared in the fossil ...
File - Watt On Earth
... lost by chance as random mating among a small number of individuals can result in the lesscommon genotype not mating. As a result, the genetic composition can change over time. (b) In a large population, it is more difficult for the less-common genotypes to be lost by chance because the absolute num ...
... lost by chance as random mating among a small number of individuals can result in the lesscommon genotype not mating. As a result, the genetic composition can change over time. (b) In a large population, it is more difficult for the less-common genotypes to be lost by chance because the absolute num ...
AP Biology Natural Selection Unit 1 HW Sheet
... What’s missing from the above mechanisms in order for natural selection to be successful? 5. What is meant by “fitness?” ...
... What’s missing from the above mechanisms in order for natural selection to be successful? 5. What is meant by “fitness?” ...
Species concepts
... migration, natural selection, and genetic drift are largely responsible for one of the most important processes in evolution ...
... migration, natural selection, and genetic drift are largely responsible for one of the most important processes in evolution ...
Chapter 22 Guided Reading Notes and the MUST
... 1. Explain the variation within a population in terms of discrete and quantitative characters as well as average heterozygosity. 2. Explain the variation between populations in terms of geographic variation. 3. What is the main source of new genes? 4. How do mutation rates vary among different organ ...
... 1. Explain the variation within a population in terms of discrete and quantitative characters as well as average heterozygosity. 2. Explain the variation between populations in terms of geographic variation. 3. What is the main source of new genes? 4. How do mutation rates vary among different organ ...
pdf - Angelo State University
... Fine fossil sites also include South Australia, Rancho La Brea, and dinosaur beds in Alberta, Canada and Utah. (Figure 6.10) Fossils occur in stratified layers; new deposits are on top of older material. “Index” or “guide” fossils are “indicators” of specific geological periods. Layers often til ...
... Fine fossil sites also include South Australia, Rancho La Brea, and dinosaur beds in Alberta, Canada and Utah. (Figure 6.10) Fossils occur in stratified layers; new deposits are on top of older material. “Index” or “guide” fossils are “indicators” of specific geological periods. Layers often til ...
Natural Selection
... Allopatric speciation due to geographic separation of the Grand Canyon. Harris's antelope squirrel (Ammospermophilus harrisi) inhabits the canyon's south rim (left). Just a few miles away on the north rim (right) lives the closely related white-tailed antelope squirrel (Ammospermophilus leucurus). A ...
... Allopatric speciation due to geographic separation of the Grand Canyon. Harris's antelope squirrel (Ammospermophilus harrisi) inhabits the canyon's south rim (left). Just a few miles away on the north rim (right) lives the closely related white-tailed antelope squirrel (Ammospermophilus leucurus). A ...
How Populations Evolve
... States what conditions must exist in a population so that it doesn’t change (no evolution) 1. The population must be very large 2. Individuals do not migrate into or out of the population. 3. Mutations do not alter the gene pool 4. Mating is random 5. Natural selection does not occur ...
... States what conditions must exist in a population so that it doesn’t change (no evolution) 1. The population must be very large 2. Individuals do not migrate into or out of the population. 3. Mutations do not alter the gene pool 4. Mating is random 5. Natural selection does not occur ...
dogs
... same region •Temporal isolation: different populations are fertile at different times •Behavior Isolation: they don’t recognize each other or the mating rituals •Mechanical isolation: morphological ...
... same region •Temporal isolation: different populations are fertile at different times •Behavior Isolation: they don’t recognize each other or the mating rituals •Mechanical isolation: morphological ...
Chapter 16 - Mrs. Pam Stewart
... happens more by chance and not by choice (has less effect on allele frequencies) ...
... happens more by chance and not by choice (has less effect on allele frequencies) ...
Exam questions
... Match the following events with the correct geological era or time from the list below. Each choice may be used once, more than once, or not at all. (Two points each) a. ...
... Match the following events with the correct geological era or time from the list below. Each choice may be used once, more than once, or not at all. (Two points each) a. ...
REVIEW UNIT 6: EVOLUTION — “TOP TEN” A. Top “10” — If you
... b. Overproduction- organisms produce more offspring than can survive c. Competition- those individuals with advantageous adaptations will outcompete others d. Differential Survival- individuals with favorable characteristics tend to survive more e. Differential Reproduction- individuals with favorab ...
... b. Overproduction- organisms produce more offspring than can survive c. Competition- those individuals with advantageous adaptations will outcompete others d. Differential Survival- individuals with favorable characteristics tend to survive more e. Differential Reproduction- individuals with favorab ...
Sympatric speciation
Sympatric speciation is the process through which new species evolve from a single ancestral species while inhabiting the same geographic region. In evolutionary biology and biogeography, sympatric and sympatry are terms referring to organisms whose ranges overlap or are even identical, so that they occur together at least in some places. If these organisms are closely related (e.g. sister species), such a distribution may be the result of sympatric speciation. Etymologically, sympatry is derived from the Greek roots συν (""together"", ""with"") and πατρίς (""homeland"" or ""fatherland""). The term was invented by Poulton in 1904, who explains the derivation.Sympatric speciation is one of three traditional geographic categories for the phenomenon of speciation. Allopatric speciation is the evolution of geographically isolated populations into distinct species. In this case, divergence is facilitated by the absence of gene flow, which tends to keep populations genetically similar. Parapatric speciation is the evolution of geographically adjacent populations into distinct species. In this case, divergence occurs despite limited interbreeding where the two diverging groups come into contact. In sympatric speciation, there is no geographic constraint to interbreeding. These categories are special cases of a continuum from zero (sympatric) to complete (allopatric) spatial segregation of diverging groups.In multicellular eukaryotic organisms, sympatric speciation is thought to be an uncommon but plausible process by which genetic divergence (through reproductive isolation) of various populations from a single parent species and inhabiting the same geographic region leads to the creation of new species.In bacteria, however, the analogous process (defined as ""the origin of new bacterial species that occupy definable ecological niches"") might be more common because bacteria are less constrained by the homogenizing effects of sexual reproduction and prone to comparatively dramatic and rapid genetic change through horizontal gene transfer.