Lecture 2
... A drastic reduction in population size; promotes genetic drift. A measure of the relative contribution of a given genotype to the next generation. Agent or causative force that results in selection. Change in a single DNA Nucleotide. Change in chromosome number of less than an entire genome. Change ...
... A drastic reduction in population size; promotes genetic drift. A measure of the relative contribution of a given genotype to the next generation. Agent or causative force that results in selection. Change in a single DNA Nucleotide. Change in chromosome number of less than an entire genome. Change ...
Convergent and Divergent Evolution - Mr. Lesiuk
... their own isolated gene pools. These individual gene pools will undergo their own changes due to Genetic Drift, Mutation and Natural Selection. During these circumstances, many new species may form from one Parental Species. This is known as ADAPTIVE RADIATION ...
... their own isolated gene pools. These individual gene pools will undergo their own changes due to Genetic Drift, Mutation and Natural Selection. During these circumstances, many new species may form from one Parental Species. This is known as ADAPTIVE RADIATION ...
06_prughNS
... ♦ Women with more education have fewer children ♦ Should society become dumber over time??? ...
... ♦ Women with more education have fewer children ♦ Should society become dumber over time??? ...
Natural Selection
... a. Some individuals are more “fit” for the environment or for life in general ex. Resistance to disease ...
... a. Some individuals are more “fit” for the environment or for life in general ex. Resistance to disease ...
Evolutionary Mechanisms
... replication error, radiation damage, etc. - relatively rare (1 per locus per 105 – 106 gametes), & often reversible, so only very small effect by itself (but produces variation that other factors can work on) ...
... replication error, radiation damage, etc. - relatively rare (1 per locus per 105 – 106 gametes), & often reversible, so only very small effect by itself (but produces variation that other factors can work on) ...
Evolution of Populations
... If trait has simple Mendelian (dominant/recessive) inheritance, there are 2 phenotypes possible. If trait has incomplete dominance or codominance, there are 3 phenotypes possible. If trait has multiple alleles, # of phenotypes depends on # of alleles ...
... If trait has simple Mendelian (dominant/recessive) inheritance, there are 2 phenotypes possible. If trait has incomplete dominance or codominance, there are 3 phenotypes possible. If trait has multiple alleles, # of phenotypes depends on # of alleles ...
Causes of Microevolution - Effingham County Schools
... curve for variations in some phenotypic character in one direction or the other by favoring what are initially relatively rare individuals that deviate from the average for that character • Diversifying Selection – occurs when environmental conditions are varied in a way that favors individuals on b ...
... curve for variations in some phenotypic character in one direction or the other by favoring what are initially relatively rare individuals that deviate from the average for that character • Diversifying Selection – occurs when environmental conditions are varied in a way that favors individuals on b ...
Biology and Evolution
... Phenotype, genotype Dominant, recessive Homozygous, heterozygous Monohybrid cross ...
... Phenotype, genotype Dominant, recessive Homozygous, heterozygous Monohybrid cross ...
Diapositiva 1
... The best example of Lamarck’s theory is about giraffes. Lamarck believed that giraffes stretched their necks to reach food. Their offspring and later generations inherited the resulting long necks. ...
... The best example of Lamarck’s theory is about giraffes. Lamarck believed that giraffes stretched their necks to reach food. Their offspring and later generations inherited the resulting long necks. ...
BIOL212TestTopicsAPR2012
... organisms and the unity and diversity of life Evolution is supported by an overwhelming amount of scientific evidence Genetic variation makes evolution possible The Hardy-Weinberg equation can be used to test whether a population is evolving Natural selection, genetic drift, and gene flow can alter ...
... organisms and the unity and diversity of life Evolution is supported by an overwhelming amount of scientific evidence Genetic variation makes evolution possible The Hardy-Weinberg equation can be used to test whether a population is evolving Natural selection, genetic drift, and gene flow can alter ...
Natural Selection and Evolution
... exchange genetic material – Occur if, for example, one organism moves from one place to another. If the characteristics of the newcomer differ from the native organisms and it adapts well and mate successfully, the genetic composition of the population will be altered ...
... exchange genetic material – Occur if, for example, one organism moves from one place to another. If the characteristics of the newcomer differ from the native organisms and it adapts well and mate successfully, the genetic composition of the population will be altered ...
reproductively separated
... • Directional- favours one extreme of the phenotype; environmental change • Disruptive- favours both extremes of the phenotype; an environmental factor takes 2 or more distinct forms (e.g. temperature)- most important in bringing about evolutionary change. Environmental factors affect the probabilit ...
... • Directional- favours one extreme of the phenotype; environmental change • Disruptive- favours both extremes of the phenotype; an environmental factor takes 2 or more distinct forms (e.g. temperature)- most important in bringing about evolutionary change. Environmental factors affect the probabilit ...
A population
... phenotypes are more likely to survive and produce more offspring. Thus, passing traits to subsequent generations. Darwin’s idea was that resources are limited and that there is competition for those resources. Natural selection is a major mechanism of evolution. Population is the smallest unit in ...
... phenotypes are more likely to survive and produce more offspring. Thus, passing traits to subsequent generations. Darwin’s idea was that resources are limited and that there is competition for those resources. Natural selection is a major mechanism of evolution. Population is the smallest unit in ...
Allele: One of the variant forms of the DNA sequence at a particular
... Allele: One of the variant forms of the DNA sequence at a particular locus, or location, on a chromosome. Different alleles can produce variation on inherited characteristics such as hair or eye color. One form of the allele (the dominant one) may be expressed more than the other form (the recessive ...
... Allele: One of the variant forms of the DNA sequence at a particular locus, or location, on a chromosome. Different alleles can produce variation on inherited characteristics such as hair or eye color. One form of the allele (the dominant one) may be expressed more than the other form (the recessive ...
Worksheet Chapter 5.1
... occurs when individuals immigrate into or emigrate out of a(n) . Biological evolution that happens by chance is called . Natural selection is the process by which traits that improve an organism’s chances for survival and are passed on more frequently to a future than those that do not. Natural sele ...
... occurs when individuals immigrate into or emigrate out of a(n) . Biological evolution that happens by chance is called . Natural selection is the process by which traits that improve an organism’s chances for survival and are passed on more frequently to a future than those that do not. Natural sele ...
Microevolution and Macroevolution
... Due to migration of breeding individuals from one population to another Isolated populations tend to be different from surrounding populations – increased gene flow changes this: Makes the population internally more varied Makes the population less varied from other populations ...
... Due to migration of breeding individuals from one population to another Isolated populations tend to be different from surrounding populations – increased gene flow changes this: Makes the population internally more varied Makes the population less varied from other populations ...
Document
... 3. Structures as different as human arms, bat wings, and dolphin flippers contain many of the same bones, which develop from similar embryonic tissues. These structural features are examples of A. homology B. analogy C. Lamarckism D. natural selection 4. A certain population has only one type of al ...
... 3. Structures as different as human arms, bat wings, and dolphin flippers contain many of the same bones, which develop from similar embryonic tissues. These structural features are examples of A. homology B. analogy C. Lamarckism D. natural selection 4. A certain population has only one type of al ...
Mechanisms of Evolution
... • Gene pool: the entire collection of alleles among a population. • Allelic frequency: The percentage of a particular allele in the gene pool of a population. – Use % b/c population size changes from gen to ...
... • Gene pool: the entire collection of alleles among a population. • Allelic frequency: The percentage of a particular allele in the gene pool of a population. – Use % b/c population size changes from gen to ...
Ch 15.3 m definitions
... Ch. 15.3 Vocabulary (M definitions) Directional Selection – type of natural selection where one extreme is favored. Disruptive Selection – type of natural selection where both extremes are favored. Genetic Drift – A quick change in allele frequencies due to a natural disaster. (likely to affect smal ...
... Ch. 15.3 Vocabulary (M definitions) Directional Selection – type of natural selection where one extreme is favored. Disruptive Selection – type of natural selection where both extremes are favored. Genetic Drift – A quick change in allele frequencies due to a natural disaster. (likely to affect smal ...
27_3 The Process of Evolution - Westgate Mennonite Collegiate
... 2. May cause syndromes and diseases (e.g. hemophilia or PKU) iv. Mutations may be beneficial 1. May give organism an advantage in a changing environment 2. Importance of recessive alleles can increase when environment changes v. Asexually reproducing prokaryotes show mutations in a population much f ...
... 2. May cause syndromes and diseases (e.g. hemophilia or PKU) iv. Mutations may be beneficial 1. May give organism an advantage in a changing environment 2. Importance of recessive alleles can increase when environment changes v. Asexually reproducing prokaryotes show mutations in a population much f ...
CB-Evolution of Populations
... a) As a result, only two phenotypes are possible in a population for this gene ...
... a) As a result, only two phenotypes are possible in a population for this gene ...
Polymorphism (biology)
Polymorphism in biology is said to occur when two or more clearly different phenotypes exist in the same population of a species—in other words, the occurrence of more than one form or morph. In order to be classified as such, morphs must occupy the same habitat at the same time and belong to a panmictic population (one with random mating).Polymorphism as described here involves morphs of the phenotype. The term is also used somewhat differently by molecular biologists to describe certain point mutations in the genotype, such as SNPs (see also RFLPs). This usage is not discussed in this article.Polymorphism is common in nature; it is related to biodiversity, genetic variation and adaptation; it usually functions to retain variety of form in a population living in a varied environment. The most common example is sexual dimorphism, which occurs in many organisms. Other examples are mimetic forms of butterflies (see mimicry), and human hemoglobin and blood types.According to the theory of evolution, polymorphism results from evolutionary processes, as does any aspect of a species. It is heritable and is modified by natural selection. In polyphenism, an individual's genetic make-up allows for different morphs, and the switch mechanism that determines which morph is shown is environmental. In genetic polymorphism, the genetic make-up determines the morph. Ants exhibit both types in a single population.Polymorphism also refers to the occurrence of structurally and functionally more than two different types of individuals, called zooids within the same organism. It is a characteristic feature of Cnidarians.For example, in Obelia there are feeding individuals, the gastrozooids; the individuals capable of asexual reproduction only, the gonozooids, blastostyles and free-living or sexually reproducing individuals, the medusae.