I. Genetic Equilibrium
... Evolution may take place when populations are subject to genetic mutations, gene flow, genetic drift, nonrandom mating, or natural selection. A. Mutations: ___________________ in the _______. B. Gene Flow: 1. Immigration – movement of individuals ___________ the group 2. Emigration – movement of ind ...
... Evolution may take place when populations are subject to genetic mutations, gene flow, genetic drift, nonrandom mating, or natural selection. A. Mutations: ___________________ in the _______. B. Gene Flow: 1. Immigration – movement of individuals ___________ the group 2. Emigration – movement of ind ...
Lecture 6 - Processes of evolution (microevolution)
... Directional selection tends to reduce genetic diversity within populations, but only if - selection pressure is constant (environmental change, not just yearly variation) - no strong counterbalancing selection pressures ...
... Directional selection tends to reduce genetic diversity within populations, but only if - selection pressure is constant (environmental change, not just yearly variation) - no strong counterbalancing selection pressures ...
BIOLOGY- Mechanisms of Evolution Unit Outline I. MICRO
... Understanding and Constructing Cladograms & Phylogenetic Trees a. Can you successfully discuss the relationships represented in this cladogram? Which species are the most closely related? The most distantly ...
... Understanding and Constructing Cladograms & Phylogenetic Trees a. Can you successfully discuss the relationships represented in this cladogram? Which species are the most closely related? The most distantly ...
OCR Biology B - Centre of the Cell
... (b) gene mutations. To include cystic fibrosis, sickle cell anaemia. ...
... (b) gene mutations. To include cystic fibrosis, sickle cell anaemia. ...
POPULATION GENETICS Terms 1.
... Heritability (h 2) = the degree to which a particular trait is inherited. R = ?G = response of a population (given by the new population mean after selection) S = Sd = selection imposed on the trait (can be strong or weak, and is different between selected and unselected population means) R = h2S ...
... Heritability (h 2) = the degree to which a particular trait is inherited. R = ?G = response of a population (given by the new population mean after selection) S = Sd = selection imposed on the trait (can be strong or weak, and is different between selected and unselected population means) R = h2S ...
Test Review Questions
... 4. True or false? A gene pool consists of all genes including all the different alleles, that are present in a population. 5. True or False? Allele frequency has to do with whether the allele is dominant or recessive. 6. List the 3 sources of genetic/heritable variation. 7. A _______________________ ...
... 4. True or false? A gene pool consists of all genes including all the different alleles, that are present in a population. 5. True or False? Allele frequency has to do with whether the allele is dominant or recessive. 6. List the 3 sources of genetic/heritable variation. 7. A _______________________ ...
Population Genetics and Speciation
... trait in a population • Assume a gene pool of 10 gametes for a gene which is controlled by only 2 alleles – 8 are allele A – 2 are allele a – Frequency of A is 8/10 or .8 – Frequency of a is 2/10 or .2 – How many light blue individuals would you expect in a population of 100? 0.2 X 0.2 = .04 or 4 li ...
... trait in a population • Assume a gene pool of 10 gametes for a gene which is controlled by only 2 alleles – 8 are allele A – 2 are allele a – Frequency of A is 8/10 or .8 – Frequency of a is 2/10 or .2 – How many light blue individuals would you expect in a population of 100? 0.2 X 0.2 = .04 or 4 li ...
CPS - General Biology Review.cps
... predict the traits of the o!spring produced by genetic crosses determine the actual outcomes of genetic crosses predict the traits of the parents used in genetic crosses decide which organisms are best to use in genetic crosses ...
... predict the traits of the o!spring produced by genetic crosses determine the actual outcomes of genetic crosses predict the traits of the parents used in genetic crosses decide which organisms are best to use in genetic crosses ...
Ch.16 Notes - Green Local Schools
... • p = freq. of dominant allele • q = freq. of recessive allele • Phenotype frequency: # of individuals w/ a particular phenotype / total # of individuals ...
... • p = freq. of dominant allele • q = freq. of recessive allele • Phenotype frequency: # of individuals w/ a particular phenotype / total # of individuals ...
Genetics and Evolution Question sheet Answer Key
... - The number of times an allele occurs within a gene pool compared to the number of times other alleles for the same gene occur 7) What is the relative frequency of the hair colour allele in this class? 8) How else can we view evolutionary change? Give an example. ...
... - The number of times an allele occurs within a gene pool compared to the number of times other alleles for the same gene occur 7) What is the relative frequency of the hair colour allele in this class? 8) How else can we view evolutionary change? Give an example. ...
HERE
... Natural selection is a major mechanism of evolution Natural selection acts on phenotypic variations within populations. Evolutionary change is also driven by random processes. Biological evolution is supported by scientific evidence from many disciplines including mathematics Organisms share many co ...
... Natural selection is a major mechanism of evolution Natural selection acts on phenotypic variations within populations. Evolutionary change is also driven by random processes. Biological evolution is supported by scientific evidence from many disciplines including mathematics Organisms share many co ...
Slide 1
... Sexual Recombination • In sexually reproducing populations, sexual recombination is far more important than mutation in producing the genetic differences that make adaptation possible • Most variation is produced by genetic differences that result from recombination of existing alleles • Recombinat ...
... Sexual Recombination • In sexually reproducing populations, sexual recombination is far more important than mutation in producing the genetic differences that make adaptation possible • Most variation is produced by genetic differences that result from recombination of existing alleles • Recombinat ...
slides - UBC Botany
... lose different alleles. The probability that a particular allele will be fixed in a population in the future equals the frequency of the allele in the population. ...
... lose different alleles. The probability that a particular allele will be fixed in a population in the future equals the frequency of the allele in the population. ...
14. Synthetic theory of evolution
... is the movement of alleles between populations by (the migration of breeding individuals) Gene flow can increase the variation within a population by introducing novel alleles that were produced by mutation in some other population. Continued gene flow between populations makes their gene pools simi ...
... is the movement of alleles between populations by (the migration of breeding individuals) Gene flow can increase the variation within a population by introducing novel alleles that were produced by mutation in some other population. Continued gene flow between populations makes their gene pools simi ...
B. Inference 1
... c) Direction of change is determined by natural selection E. Gregory Mendel 1. Gives mechanism for evolution a) Genes from parents determine phenotype and genotype b) Genes could be mutated VII.NATURAL ...
... c) Direction of change is determined by natural selection E. Gregory Mendel 1. Gives mechanism for evolution a) Genes from parents determine phenotype and genotype b) Genes could be mutated VII.NATURAL ...
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.