I. Genetic Equilibrium
... Natural selection describes the tendency of beneficial alleles to become more common over time (and detrimental ones less common), genetic drift refers to the tendency of any allele to vary randomly in frequency over time due to statistical variation alone. ...
... Natural selection describes the tendency of beneficial alleles to become more common over time (and detrimental ones less common), genetic drift refers to the tendency of any allele to vary randomly in frequency over time due to statistical variation alone. ...
7. Evolution
... called macroevolution, as opposed to the small changes in genes and chromosomes that occur within a single population, or microevolution. Explosive radiations of life following mass extinctions are marked by the four eras in the geologic time scale: the Precambrian, Paleozoic, Mesozoic, and Cenozoic ...
... called macroevolution, as opposed to the small changes in genes and chromosomes that occur within a single population, or microevolution. Explosive radiations of life following mass extinctions are marked by the four eras in the geologic time scale: the Precambrian, Paleozoic, Mesozoic, and Cenozoic ...
frequency
... 1. Define the following terms: Genetic drift: random change in a gene frequency that is caused by a series of chance occurrences that cause an allele to become more or less common in a population Gene pool: a stock of different genes in an interbreeding population Genetic equilibrium: situatio ...
... 1. Define the following terms: Genetic drift: random change in a gene frequency that is caused by a series of chance occurrences that cause an allele to become more or less common in a population Gene pool: a stock of different genes in an interbreeding population Genetic equilibrium: situatio ...
Indicate whether the statement is true or false. If false
... ____ 14. According to Darwin, the word selection would indicate organisms’ ability to survive and reproduce in their particular environments. _________________________ ____ 15. The fact that species today look different from their ancestors can be described as descent with modification. ____________ ...
... ____ 14. According to Darwin, the word selection would indicate organisms’ ability to survive and reproduce in their particular environments. _________________________ ____ 15. The fact that species today look different from their ancestors can be described as descent with modification. ____________ ...
Gene Linkage PPT
... are often inherited together genetic linkage Crossing over can separate linked genes In general, alleles with loci close together will stay together; Alleles farther apart are more likely to be separated by crossing over ...
... are often inherited together genetic linkage Crossing over can separate linked genes In general, alleles with loci close together will stay together; Alleles farther apart are more likely to be separated by crossing over ...
Chapter Objectives: Chapters 23 and 24 Species and
... Explain how microevolutionary change can affect a gene pool state the Hardy-Weinberg theorem Write the general Hardy-Weinberg equation and use it to calculate allele and genotype frequencies Explain the consequences of Hardy-Weinberg equilibrium Demonstrate that a disequilibrium population requires ...
... Explain how microevolutionary change can affect a gene pool state the Hardy-Weinberg theorem Write the general Hardy-Weinberg equation and use it to calculate allele and genotype frequencies Explain the consequences of Hardy-Weinberg equilibrium Demonstrate that a disequilibrium population requires ...
The Two Steps of Natural Selection are
... For example; some beetles are green & some are brown. ...
... For example; some beetles are green & some are brown. ...
SICKLE CELL ANEMIA
... Genes provide the source of variation. The environment selects for the best adapted phenotype. An allele is only common where it will provide an advantage. (Natural Selection) ...
... Genes provide the source of variation. The environment selects for the best adapted phenotype. An allele is only common where it will provide an advantage. (Natural Selection) ...
The Peppered Moth - Mr Andrews` Science Space!
... black variety) began to decline on both sides of the Atlantic This was because the tree trunks were now paler and the black moth was easier to see The pale moth numbers now increased The agent of natural selection was the colour of the tree bark As this changed from white to black and back a ...
... black variety) began to decline on both sides of the Atlantic This was because the tree trunks were now paler and the black moth was easier to see The pale moth numbers now increased The agent of natural selection was the colour of the tree bark As this changed from white to black and back a ...
Descent with Modification and Population Evolution
... Variation among individuals favor particular individuals b. These individuals are more likely to produce offspring c. Alleles are passed on in disproportionate numbers to those of the current generation ...
... Variation among individuals favor particular individuals b. These individuals are more likely to produce offspring c. Alleles are passed on in disproportionate numbers to those of the current generation ...
File
... is started by a few members of the original population. This small population size means that the colony may have: reduced genetic variation from the original population. a non-random sample of the genes in the original population. ...
... is started by a few members of the original population. This small population size means that the colony may have: reduced genetic variation from the original population. a non-random sample of the genes in the original population. ...
evolution - wentworth science
... • It was observed, in the 1800’s, that vertebrate embryos look quite similar to each other in early development • All vertebrates have gill slits at some point in their development. Only fish retain them in adulthood • The plausible explanation is that early forms had these traits and passed the gen ...
... • It was observed, in the 1800’s, that vertebrate embryos look quite similar to each other in early development • All vertebrates have gill slits at some point in their development. Only fish retain them in adulthood • The plausible explanation is that early forms had these traits and passed the gen ...
Selection and Speciation
... frequency of phenotypes in a population. The graph has a normal distribution with a fairly large standard deviation, this is before natural selection has occurred. • The second graph is a frequency distribution of the same population after natural selection has occurred. The standard deviation of th ...
... frequency of phenotypes in a population. The graph has a normal distribution with a fairly large standard deviation, this is before natural selection has occurred. • The second graph is a frequency distribution of the same population after natural selection has occurred. The standard deviation of th ...
Genetic Equilibrium Honors Biology Mr. Lee Room 320
... Explain Hardy-Weinberg genetic equilibrium: This is a tool used by scientist to determine what forces are disrupting genetic equilibrium Sets up a hypothetical population that is not ...
... Explain Hardy-Weinberg genetic equilibrium: This is a tool used by scientist to determine what forces are disrupting genetic equilibrium Sets up a hypothetical population that is not ...
Evolution and Ecology
... of random mating. 3. A single generation of random mating establishes binomial genotype frequencies, and neither these frequencies, nor the allele frequencies p and q, will change in subsequent generations. The gene pool is in equilibrium – a non-evolving population. VI. ...
... of random mating. 3. A single generation of random mating establishes binomial genotype frequencies, and neither these frequencies, nor the allele frequencies p and q, will change in subsequent generations. The gene pool is in equilibrium – a non-evolving population. VI. ...
Early Ideas About Evolution
... 10.3 – Theory of Natural Selection Key Concept: Darwin proposed natural selection as a mechanism for evolution. Several key insights led to Darwin’s idea for natural selection. Natural selection: mechanism by which _________________________________________________ ______________________________ ...
... 10.3 – Theory of Natural Selection Key Concept: Darwin proposed natural selection as a mechanism for evolution. Several key insights led to Darwin’s idea for natural selection. Natural selection: mechanism by which _________________________________________________ ______________________________ ...
xCh 13 evolution Sp11
... Tends to reduce genetic differences between populations. The migration of people throughout the world increases gene flow and introduces new alleles An important agent of evolutionary change ...
... Tends to reduce genetic differences between populations. The migration of people throughout the world increases gene flow and introduces new alleles An important agent of evolutionary change ...
Natural Selection Essential Questions
... They can cause ________________ disorders (________________) They lead to genetic ___________ and may lead to traits that are beneficial for survival (____________) 13. Why is genetic variation important? Many differences in ________________ (different alleles) produce many different _________ ...
... They can cause ________________ disorders (________________) They lead to genetic ___________ and may lead to traits that are beneficial for survival (____________) 13. Why is genetic variation important? Many differences in ________________ (different alleles) produce many different _________ ...
Genome variation informatics: SNP discovery, demographic
... Redevelopment and expansion • Improve the detection of very rare alleles by taking into account recent results in Population Genetics (i.e. a priori, rare alleles are more frequent than common alleles) • Developing a rigorous statistical framework both for heterozygote polymorphisms and INDELs • Ca ...
... Redevelopment and expansion • Improve the detection of very rare alleles by taking into account recent results in Population Genetics (i.e. a priori, rare alleles are more frequent than common alleles) • Developing a rigorous statistical framework both for heterozygote polymorphisms and INDELs • Ca ...
Gene pool
... Figure 23.14 Diversifying selection in a finch population The beaks on these birds represent two extremes where the smaller beaks on the left feed efficiently on soft seeds while the larger- beaked birds feed efficiently on the hard seeds. It’s easier to see why an intermediate sized beak would not ...
... Figure 23.14 Diversifying selection in a finch population The beaks on these birds represent two extremes where the smaller beaks on the left feed efficiently on soft seeds while the larger- beaked birds feed efficiently on the hard seeds. It’s easier to see why an intermediate sized beak would not ...
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.