File
... smaller the population, the more 4. Extremely Large Population Size; The _________ likely allele frequency will fluctuate by chance. 5. No Gene Flow; By moving alleles into and out of populations, gene flow can alter allele frequencies. ...
... smaller the population, the more 4. Extremely Large Population Size; The _________ likely allele frequency will fluctuate by chance. 5. No Gene Flow; By moving alleles into and out of populations, gene flow can alter allele frequencies. ...
](http://s1.studyres.com/store/data/001721623_1-69fcbdec70bfee1d40a34e941c406e4f-300x300.png)
4th Exam is Thursday, December 9
... Because the number of possible genotypes is so large, at any given time, a population will only represent a small fraction of the possible genotypes. Mendelian assortment and recombination produce new allele combinations, but do not produce new alleles. ...
... Because the number of possible genotypes is so large, at any given time, a population will only represent a small fraction of the possible genotypes. Mendelian assortment and recombination produce new allele combinations, but do not produce new alleles. ...
APBio Feb7 PopGen
... They asked “Why doesn’t a population, after a long time, just consist of individuals with the dominant phenotype?” Well, they realized the original proportions of the genotypes will remain constant as long as…. ...
... They asked “Why doesn’t a population, after a long time, just consist of individuals with the dominant phenotype?” Well, they realized the original proportions of the genotypes will remain constant as long as…. ...
Lecture 9
... 2. Random mating- the probability of mating between individuals is independent of their genetic constitution—no assortative mating 3. Large population size i.e., population size is effectively infinite. To reduce sampling error with generations 4. Males and females have similar allele frequencies. 5 ...
... 2. Random mating- the probability of mating between individuals is independent of their genetic constitution—no assortative mating 3. Large population size i.e., population size is effectively infinite. To reduce sampling error with generations 4. Males and females have similar allele frequencies. 5 ...
Lesson Overview
... NS is not the only source of change in allele frequencies Genetic drift – change in allele frequency that occurs in small populations due to random chance *Genetic bottleneck – change in allele frequency following a dramatic reduction in population size ...
... NS is not the only source of change in allele frequencies Genetic drift – change in allele frequency that occurs in small populations due to random chance *Genetic bottleneck – change in allele frequency following a dramatic reduction in population size ...
NATURAL SELECTION
... evolution of new species Darwin himself favoured a long period of slow changes Recently this has been refined to include the possibility of rapid changes over a short period of time (punctuated equilibrium) ...
... evolution of new species Darwin himself favoured a long period of slow changes Recently this has been refined to include the possibility of rapid changes over a short period of time (punctuated equilibrium) ...
Lecture Outline
... 1. Studies of the comparative morphology of seemingly unrelated animals led to questions of why certain structures should be so similar, (for example: pelvic girdle bones in snakes). 2. One explanation: Some body parts were so perfect at the time of creation there was no need for any variation. But ...
... 1. Studies of the comparative morphology of seemingly unrelated animals led to questions of why certain structures should be so similar, (for example: pelvic girdle bones in snakes). 2. One explanation: Some body parts were so perfect at the time of creation there was no need for any variation. But ...
Honors Biology Semester 2 Final Exam Review
... totally and received a grade of F. Sorry. In the highly unlikely event that these traits are genetic rather than environmental, if these traits involve dominant and recessive alleles, and if the four (4%) represent the frequency of the homozygous recessive condition, please calculate the following: ...
... totally and received a grade of F. Sorry. In the highly unlikely event that these traits are genetic rather than environmental, if these traits involve dominant and recessive alleles, and if the four (4%) represent the frequency of the homozygous recessive condition, please calculate the following: ...
Allele - Mr Waring`s Biology Blog
... Condition in which the alleles of a particular gene are different Heterozygous A group of genetically identical organisms formed from a single parent as a result of asexual reproduction or artificial means Clone The number of times an allele occurs within the gene pool Allele Frequency A term applie ...
... Condition in which the alleles of a particular gene are different Heterozygous A group of genetically identical organisms formed from a single parent as a result of asexual reproduction or artificial means Clone The number of times an allele occurs within the gene pool Allele Frequency A term applie ...
Evolution notes 2
... Species – type of organism that can only mate with similar organisms to make viable fertile offspring (AP book 474-5) - Prezygotic barrier Geographic isolation Temporal (time) isolation Behavioral isolation -Postzygotic barrier Reduced hybrid viability Fertility Breakdown ...
... Species – type of organism that can only mate with similar organisms to make viable fertile offspring (AP book 474-5) - Prezygotic barrier Geographic isolation Temporal (time) isolation Behavioral isolation -Postzygotic barrier Reduced hybrid viability Fertility Breakdown ...
Evolution 1/e
... sample of gametes are drawn at random from the gene pool. The small sample drawn mimics the effects of drift because allele frequencies in the sample can differ a lot from the starting gene pool. ...
... sample of gametes are drawn at random from the gene pool. The small sample drawn mimics the effects of drift because allele frequencies in the sample can differ a lot from the starting gene pool. ...
6.2 Human Genetic Disorders
... 7.2.d Students know plant and animal cells contain many thousands of different genes and typically have two copies of every gene. The two copies (or alleles) of the gene may or may not be identical, and one may be dominant in determining the phenotype while the other is recessive. ...
... 7.2.d Students know plant and animal cells contain many thousands of different genes and typically have two copies of every gene. The two copies (or alleles) of the gene may or may not be identical, and one may be dominant in determining the phenotype while the other is recessive. ...
Mechanisms of Divergence •Natural selection •Genetic Drift •Sexual
... •Genetic Drift •Sexual Selection Genetic drift •Random changes in populations due to incomplete “sampling” of genetic variation (alleles). •Affects small populations •The main consequence is a rapid (very likely nonadaptive) divergence from the original population. •Selection will filter variance do ...
... •Genetic Drift •Sexual Selection Genetic drift •Random changes in populations due to incomplete “sampling” of genetic variation (alleles). •Affects small populations •The main consequence is a rapid (very likely nonadaptive) divergence from the original population. •Selection will filter variance do ...
Chapter 3-1 • Definitions: - Genetics: the scientific study of heredity
... - Genetics: the scientific study of heredity - Heredity: the passing of traits from parent to offspring - Trait: different physical characteristics - Purebred: an organism that always produces offspring with the same form of a trait as the parent - Gene: factor that controls traits - Allele: differe ...
... - Genetics: the scientific study of heredity - Heredity: the passing of traits from parent to offspring - Trait: different physical characteristics - Purebred: an organism that always produces offspring with the same form of a trait as the parent - Gene: factor that controls traits - Allele: differe ...
3HardyWeinbergPreLab
... To justify data from mathematical models based on the Hardy-Weinberg equilibrium To analyze genetic drift and the effects of selection in the evolution of specific populations To describe a model that represents evolution within a population To evaluate data sets that illustrate evolution as an ongo ...
... To justify data from mathematical models based on the Hardy-Weinberg equilibrium To analyze genetic drift and the effects of selection in the evolution of specific populations To describe a model that represents evolution within a population To evaluate data sets that illustrate evolution as an ongo ...
Chapter 11 Quiz
... a. Both parents were tall. b. Both parents were short. c. Both parents contributed a recessive allele. d. Both parents contributed a dominant allele. ...
... a. Both parents were tall. b. Both parents were short. c. Both parents contributed a recessive allele. d. Both parents contributed a dominant allele. ...
Population Genetics and Patterns of Evolution
... mates based on traits does not occur • No genetic drift- genetic drift is a random change of frequency of an allele because the population is small. Natural selection effects small populations much more than large ones. • No immigration or emigration- no new individuals can add to the gene pool ...
... mates based on traits does not occur • No genetic drift- genetic drift is a random change of frequency of an allele because the population is small. Natural selection effects small populations much more than large ones. • No immigration or emigration- no new individuals can add to the gene pool ...
Population Genetics - Bev Facey Community High
... In a hypothetical population of squirrels, the dominant fur color is black. A recessive allele for grey fur color occurs with a frequency of 0.3. What is the frequency of the heterozygous genotype? 3. Suppose that within a population of garter snakes, 408 of 1700 snakes exhibit a recessive stripe co ...
... In a hypothetical population of squirrels, the dominant fur color is black. A recessive allele for grey fur color occurs with a frequency of 0.3. What is the frequency of the heterozygous genotype? 3. Suppose that within a population of garter snakes, 408 of 1700 snakes exhibit a recessive stripe co ...
Genetic drift
Genetic drift (or allelic drift) is the change in the frequency of a gene variant (allele) in a population due to random sampling of organisms.The alleles in the offspring are a sample of those in the parents, and chance has a role in determining whether a given individual survives and reproduces. A population's allele frequency is the fraction of the copies of one gene that share a particular form. Genetic drift may cause gene variants to disappear completely and thereby reduce genetic variation.When there are few copies of an allele, the effect of genetic drift is larger, and when there are many copies the effect is smaller. In the early twentieth century vigorous debates occurred over the relative importance of natural selection versus neutral processes, including genetic drift. Ronald Fisher, who explained natural selection using Mendelian genetics, held the view that genetic drift plays at the most a minor role in evolution, and this remained the dominant view for several decades. In 1968, Motoo Kimura rekindled the debate with his neutral theory of molecular evolution, which claims that most instances where a genetic change spreads across a population (although not necessarily changes in phenotypes) are caused by genetic drift. There is currently a scientific debate about how much of evolution has been caused by natural selection, and how much by genetic drift.