Evolution
... What is a species? • Biological species concept: This concept states that "a species is a group of actually or potentially interbreeding individuals who are reproductively isolated from other such groups." ...
... What is a species? • Biological species concept: This concept states that "a species is a group of actually or potentially interbreeding individuals who are reproductively isolated from other such groups." ...
Evolution Unit
... In addition to natural selection, evolutionary change is also driven by random processes… ...
... In addition to natural selection, evolutionary change is also driven by random processes… ...
Selection Drift Isolating mechanisms
... possible that rare alleles may not be passed to the next generation, simply by chance. In which case, the variation will be lost. Alternatively, it is possible that a variant or possibly a mutation could be passed on, and its frequency increase as a result of inbreeding. So, with the founder effect, ...
... possible that rare alleles may not be passed to the next generation, simply by chance. In which case, the variation will be lost. Alternatively, it is possible that a variant or possibly a mutation could be passed on, and its frequency increase as a result of inbreeding. So, with the founder effect, ...
Chapter 15 Reading Guide - Student
... 33. What is a synonymous substitution (also called a silent substitution)? (You should already know this.) Despite not affecting the functioning of a protein, what other consequences of this substitution exists? ...
... 33. What is a synonymous substitution (also called a silent substitution)? (You should already know this.) Despite not affecting the functioning of a protein, what other consequences of this substitution exists? ...
Natural selection worksheet 1 - Summer Research Program for
... coats and ones with medium coats. It is fall, soon to be winter. The temperatures are dropping rapidly and the bears must be kept warm, or they will freeze to death. Many of the bears have had ~2 cubs each but due to the extreme temperatures, many mothers only have one cub left. ...
... coats and ones with medium coats. It is fall, soon to be winter. The temperatures are dropping rapidly and the bears must be kept warm, or they will freeze to death. Many of the bears have had ~2 cubs each but due to the extreme temperatures, many mothers only have one cub left. ...
Concept 14.1 - Hatboro
... chart stretches of the South American coast. Darwin’s job was to document the plants, animals and geology encountered during the voyage, but more came from ...
... chart stretches of the South American coast. Darwin’s job was to document the plants, animals and geology encountered during the voyage, but more came from ...
ppt
... Genetic Drift Relaxing another assumption: infinite populations Genetic drift is a consequence of having small populations Definition: chance changes in allele frequency that result from the sampling of gametes from generation to generation in a finite population Assume (for now) Hardy-Weinberg con ...
... Genetic Drift Relaxing another assumption: infinite populations Genetic drift is a consequence of having small populations Definition: chance changes in allele frequency that result from the sampling of gametes from generation to generation in a finite population Assume (for now) Hardy-Weinberg con ...
Study Questions for Exam #1
... what major events marked the transitions between these eras. Summarize major milestones of animal evolution and know approximately when they occurred, for example: The Cambrian “explosion” Origin of jawed fishes Early diversification of the major fish clades Origin of tetrapod vertebrates ...
... what major events marked the transitions between these eras. Summarize major milestones of animal evolution and know approximately when they occurred, for example: The Cambrian “explosion” Origin of jawed fishes Early diversification of the major fish clades Origin of tetrapod vertebrates ...
Evolution as Genetic Change
... Evolution as Genetic Change • Natural selection acts on phenotypes, survival and reproduction determine which alleles are inherited, changing relative frequencies of alleles in a population over time. • Thus evolution is any change in the relative frequencies of alleles in a population’s gene pool ...
... Evolution as Genetic Change • Natural selection acts on phenotypes, survival and reproduction determine which alleles are inherited, changing relative frequencies of alleles in a population over time. • Thus evolution is any change in the relative frequencies of alleles in a population’s gene pool ...
Ch 23
... 12. List the five conditions that must be met for a population to remain in HardyWeinberg equilibrium. 13. Write the Hardy-Weinberg equation. Use the equation to calculate allele frequencies when the frequency of homozygous recessive individuals in a population is 25%. Natural Selection, Genetic Dri ...
... 12. List the five conditions that must be met for a population to remain in HardyWeinberg equilibrium. 13. Write the Hardy-Weinberg equation. Use the equation to calculate allele frequencies when the frequency of homozygous recessive individuals in a population is 25%. Natural Selection, Genetic Dri ...
CHAPTER 23
... 12. List the five conditions that must be met for a population to remain in HardyWeinberg equilibrium. 13. Write the Hardy-Weinberg equation. Use the equation to calculate allele frequencies when the frequency of homozygous recessive individuals in a population is 25%. Natural Selection, Genetic Dri ...
... 12. List the five conditions that must be met for a population to remain in HardyWeinberg equilibrium. 13. Write the Hardy-Weinberg equation. Use the equation to calculate allele frequencies when the frequency of homozygous recessive individuals in a population is 25%. Natural Selection, Genetic Dri ...
learning objectives
... 12. List the five conditions that must be met for a population to remain in HardyWeinberg equilibrium. 13. Write the Hardy-Weinberg equation. Use the equation to calculate allele frequencies when the frequency of homozygous recessive individuals in a population is 25%. Natural Selection, Genetic Dri ...
... 12. List the five conditions that must be met for a population to remain in HardyWeinberg equilibrium. 13. Write the Hardy-Weinberg equation. Use the equation to calculate allele frequencies when the frequency of homozygous recessive individuals in a population is 25%. Natural Selection, Genetic Dri ...
Week 1
... Sexual Selection • A feedback system • One sex develops preference for trait • If it increases differential reproductive success, preference for trait spreads to offspring • Members of opposite sex that have the desired trait will also, therefore, spread the trait to their offspring ...
... Sexual Selection • A feedback system • One sex develops preference for trait • If it increases differential reproductive success, preference for trait spreads to offspring • Members of opposite sex that have the desired trait will also, therefore, spread the trait to their offspring ...
AP biology-Exam Review Unit 1 Evolution
... B) Stabilizing selection occurs in environments where severe storms are common, selecting for sparrows with mediumsized wings. C) Disruptive selection selects for both sparrows with long and medium-sized wings in environments where severe storms are common. D) The frequency and severity of storms ha ...
... B) Stabilizing selection occurs in environments where severe storms are common, selecting for sparrows with mediumsized wings. C) Disruptive selection selects for both sparrows with long and medium-sized wings in environments where severe storms are common. D) The frequency and severity of storms ha ...
Darwin`s Ideas and Natural Selection
... In addition to natural selection, evolutionary change is also driven by random processes… ...
... In addition to natural selection, evolutionary change is also driven by random processes… ...
Natural Selection
... Findings: The long-tailed widowbirds were more successful at mating and had more offspring (whether their tails were long naturally or pasted on) ...
... Findings: The long-tailed widowbirds were more successful at mating and had more offspring (whether their tails were long naturally or pasted on) ...
Big_Idea_1.A.1 Natural Selection
... our population of fish — the fish gene pool. As in nature, Strawfish are diploid organisms — they have two copies of every gene. The color of each fish is always determined by the interaction of the two copies (the ...
... our population of fish — the fish gene pool. As in nature, Strawfish are diploid organisms — they have two copies of every gene. The color of each fish is always determined by the interaction of the two copies (the ...
AP Biology Study Guide
... 2. Briefly summarize the history of evolutionary thought. 3. Explain how Darwin’s voyage on the Beagle influenced his thinking. 4. Describe the ideas and events that led to Darwin’s 1859 publication of The Origin of Species. 5. Explain how the work of Thomas Malthus and the process of artificial sel ...
... 2. Briefly summarize the history of evolutionary thought. 3. Explain how Darwin’s voyage on the Beagle influenced his thinking. 4. Describe the ideas and events that led to Darwin’s 1859 publication of The Origin of Species. 5. Explain how the work of Thomas Malthus and the process of artificial sel ...
Group selection
Group selection is a proposed mechanism of evolution in which natural selection is imagined to act at the level of the group, instead of at the more conventional level of the individual.Early authors such as V. C. Wynne-Edwards and Konrad Lorenz argued that the behavior of animals could affect their survival and reproduction as groups.From the mid 1960s, evolutionary biologists such as John Maynard Smith argued that natural selection acted primarily at the level of the individual. They argued on the basis of mathematical models that individuals would not altruistically sacrifice fitness for the sake of a group. They persuaded the majority of biologists that group selection did not occur, other than in special situations such as the haplodiploid social insects like honeybees (in the Hymenoptera), where kin selection was possible.In 1994 David Sloan Wilson and Elliott Sober argued for multi-level selection, including group selection, on the grounds that groups, like individuals, could compete. In 2010 three authors including E. O. Wilson, known for his work on ants, again revisited the arguments for group selection, provoking a strong rebuttal from a large group of evolutionary biologists. As of yet, there is no clear consensus among biologists regarding the importance of group selection.