Evolution of populations exam answer key
... 5) Traits that are controlled by more than one gene are known as _______________________ a) Dominant traits b) Recessive traits c) Singe-gene traits d) Polygenic traits 6) How many phenotypes can a single-gene trait produce? a) One ...
... 5) Traits that are controlled by more than one gene are known as _______________________ a) Dominant traits b) Recessive traits c) Singe-gene traits d) Polygenic traits 6) How many phenotypes can a single-gene trait produce? a) One ...
Introduction to History of Life Biological evolution
... The frequencies of alleles fluctuate by pure chance, eventually one allele will replace the others Genetic drift is most important when the alleles of a gene are neutral—that is, when they do not substantially differ in their effects on survival or reproduction—and it proceeds faster, the smaller th ...
... The frequencies of alleles fluctuate by pure chance, eventually one allele will replace the others Genetic drift is most important when the alleles of a gene are neutral—that is, when they do not substantially differ in their effects on survival or reproduction—and it proceeds faster, the smaller th ...
Natural Selection
... Artificial Selection: the process by which humans change a species by breeding it for ...
... Artificial Selection: the process by which humans change a species by breeding it for ...
evolution of populations
... o ________ ______---a random change in the frequency of a gene---occurs most efficiently in small populations. o Genetic drift may occur when a small group of individuals colonizes a new habitat. These individuals may carry alleles in different relative frequencies than did the larger population fro ...
... o ________ ______---a random change in the frequency of a gene---occurs most efficiently in small populations. o Genetic drift may occur when a small group of individuals colonizes a new habitat. These individuals may carry alleles in different relative frequencies than did the larger population fro ...
Unit 3 Evolution 2
... example, birth weight of human babies is maintained at an intermediate weight because babies that are too big or too small have less chance of being born healthy. ...
... example, birth weight of human babies is maintained at an intermediate weight because babies that are too big or too small have less chance of being born healthy. ...
Outcomes of Natural Selection (Chapter 19)
... • punctuated equilibrium- instead of a slow, continuous movement, evolution tends to be characterized by long periods of virtual standstill (equilibrium or stasis), "punctuated" by episodes of very fast development of new forms. ...
... • punctuated equilibrium- instead of a slow, continuous movement, evolution tends to be characterized by long periods of virtual standstill (equilibrium or stasis), "punctuated" by episodes of very fast development of new forms. ...
Population Genetics - Bibb County Schools
... – It occurs when a few individuals start a new population. – The founder effect is genetic drift that occurs after start of new population. ...
... – It occurs when a few individuals start a new population. – The founder effect is genetic drift that occurs after start of new population. ...
Vocabulary Review
... 2. When two related species live in the same area but mate during different seasons, they are separated by directional selection. ...
... 2. When two related species live in the same area but mate during different seasons, they are separated by directional selection. ...
Natural Selection and Specation
... gene that exist in frequencies different from other populations • Do not possess allele IB therefore cannot be B or AB blood groups • Isolation for over 50,000 years means limited gene flow • Increased genetic flow has lead this to change ...
... gene that exist in frequencies different from other populations • Do not possess allele IB therefore cannot be B or AB blood groups • Isolation for over 50,000 years means limited gene flow • Increased genetic flow has lead this to change ...
practice
... 5) North American flying squirrels can be found at night gliding among the tree-tops gathering insects for food. The Australian Sugar glider essentially leads the same lifestyle. If they were placed side by side, they would look essentially the same; except one is a marsupial mammal and the other i ...
... 5) North American flying squirrels can be found at night gliding among the tree-tops gathering insects for food. The Australian Sugar glider essentially leads the same lifestyle. If they were placed side by side, they would look essentially the same; except one is a marsupial mammal and the other i ...
Evolution
... Genetic variation is stored in a population’s gene pool Made up of all the alleles of all individuals in a population Allele frequency: a measure of how common a certain allele is in a ...
... Genetic variation is stored in a population’s gene pool Made up of all the alleles of all individuals in a population Allele frequency: a measure of how common a certain allele is in a ...
Population Genetics
... Hardy-Weinberg equilibrium • gene and genotype frequency do not change due to sexual reproduction alone ...
... Hardy-Weinberg equilibrium • gene and genotype frequency do not change due to sexual reproduction alone ...
Name: Block: ______ Lab Biology Chapter 16 The Evolution of
... Fifty percent of an experimental population of four o’clock flowers are red flowered plants, and 50 percent are white flowered plants. What is the frequency of the r ...
... Fifty percent of an experimental population of four o’clock flowers are red flowered plants, and 50 percent are white flowered plants. What is the frequency of the r ...
Chapter 23 Evolution of Populations
... • May not be adaptive to the environment, but increases reproduction success of the individual. • This is a VERY important selection type for species. ...
... • May not be adaptive to the environment, but increases reproduction success of the individual. • This is a VERY important selection type for species. ...
how-is-genetic-variation-maintained 18 kb how-is-genetic
... How is genetic variation maintained? Under natural selection we would expect that the advantageous alleles would be selected for and the disadvantageous alleles would be selected against, resulting in stabilising selection and a monomorphic population. It is therefore hard to see why polymorphisms e ...
... How is genetic variation maintained? Under natural selection we would expect that the advantageous alleles would be selected for and the disadvantageous alleles would be selected against, resulting in stabilising selection and a monomorphic population. It is therefore hard to see why polymorphisms e ...
Forces of Microevolution Examples
... 2. Rabbits are either black or white to blend with either black or white stones. Grey rabbits don’t blend into any background and are easily eaten by predators. What is this an example of? (Disruptive selection, one outcome of natural selection) 3. Orange throated (homozygous dominant), yellow-throa ...
... 2. Rabbits are either black or white to blend with either black or white stones. Grey rabbits don’t blend into any background and are easily eaten by predators. What is this an example of? (Disruptive selection, one outcome of natural selection) 3. Orange throated (homozygous dominant), yellow-throa ...
Genes and Evolution
... If all of these criteria are not met, then the genetic structure of the population will change over time. Microevolution is occurring. The five agents of microevolution, genetic drift, gene flow, mutation, sexual selection, and natural selection represent departure from the five ...
... If all of these criteria are not met, then the genetic structure of the population will change over time. Microevolution is occurring. The five agents of microevolution, genetic drift, gene flow, mutation, sexual selection, and natural selection represent departure from the five ...
Population Genetics
... I. Genes and Variation Relative (allelic) frequency - the percentage of a particular allele (trait) in a gene pool. Natural Selection- In nature, unequal ability to survive and reproduce Artificial Selection- Mankind “selects” for desired traits ...
... I. Genes and Variation Relative (allelic) frequency - the percentage of a particular allele (trait) in a gene pool. Natural Selection- In nature, unequal ability to survive and reproduce Artificial Selection- Mankind “selects” for desired traits ...
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.