013368718X_CH17_267
... 10. Reproductive isolation occurs when members of two populations do not interbreed and produce fertile offspring. 11. The separation of two populations by barriers such as rivers or mountains results in temporal isolation. 12. The Hardy-Weinberg principle states that allele frequencies in a populat ...
... 10. Reproductive isolation occurs when members of two populations do not interbreed and produce fertile offspring. 11. The separation of two populations by barriers such as rivers or mountains results in temporal isolation. 12. The Hardy-Weinberg principle states that allele frequencies in a populat ...
Quiz 11 1. Which is NOT a requirement for a population to satisfy the
... to satisfy the conditions of the HardyWeinberg Principal? a. there must be no genetic change in the population b. there must be no differences in survival ability among individuals c. the population size must be large d. the two alleles must occur in equal frequency 2. Sunflowers can have a single l ...
... to satisfy the conditions of the HardyWeinberg Principal? a. there must be no genetic change in the population b. there must be no differences in survival ability among individuals c. the population size must be large d. the two alleles must occur in equal frequency 2. Sunflowers can have a single l ...
Population Genetics
... traits in a population over several generations Evolution is only apparent when a population is tracked over time ...
... traits in a population over several generations Evolution is only apparent when a population is tracked over time ...
Genetic Drift, Founder Effect, Bottleneck Effect
... Genetic Drift • Is a change in the allele frequencies of a population as a result of chance processes. • It happens in small populations where chance alone can play a considerable role. • Heterozygous gene pairs tend to become homozygous for one allele by chance rather than selection, so that the a ...
... Genetic Drift • Is a change in the allele frequencies of a population as a result of chance processes. • It happens in small populations where chance alone can play a considerable role. • Heterozygous gene pairs tend to become homozygous for one allele by chance rather than selection, so that the a ...
Evolution chapters 16-17 test review sheet 1. Biologists in Darwin`s
... 16. What is the allele frequency of an allele that makes up one half of the populations allele? ...
... 16. What is the allele frequency of an allele that makes up one half of the populations allele? ...
READING GUIDE: 17.1 – Genes and Variation (p. 482
... 4) What are single gene traits? How many different phenotypes are possible with single gene traits? 5) What are polygenic traits? How many different phenotypes are possible with polygenic traits? 6) Examine the graph in Figure 17.5. What does the shape of the graph indicate about height in humans? 7 ...
... 4) What are single gene traits? How many different phenotypes are possible with single gene traits? 5) What are polygenic traits? How many different phenotypes are possible with polygenic traits? 6) Examine the graph in Figure 17.5. What does the shape of the graph indicate about height in humans? 7 ...
Species
... • Allele frequency = # of a certain allele/ total # of alleles – Out of 10 possible alleles, 4 are A. 4/10 = 0.4 or 40% – Chance of 2 alleles combining = (freq A)(freq A) = 0.16 ...
... • Allele frequency = # of a certain allele/ total # of alleles – Out of 10 possible alleles, 4 are A. 4/10 = 0.4 or 40% – Chance of 2 alleles combining = (freq A)(freq A) = 0.16 ...
Evolution
... interbreeding but have different mating rituals or routines. i.e. eastern & western meadowlarks ...
... interbreeding but have different mating rituals or routines. i.e. eastern & western meadowlarks ...
reproductively separated
... • 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 probability of a gene being passed on and its frequency within the gene pool ...
... • 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 probability of a gene being passed on and its frequency within the gene pool ...
No Slide Title
... Population genetics: focus on allele frequencies (the “gene pool” = all the gametes in a big pot!) Hardy-Weinberg calculations (e.g., p2 + 2pq + q2) assume: – Mating is random (but there is stratification and assortative mating) – Population is large (if appropriately chosen!) – No mutation (but the ...
... Population genetics: focus on allele frequencies (the “gene pool” = all the gametes in a big pot!) Hardy-Weinberg calculations (e.g., p2 + 2pq + q2) assume: – Mating is random (but there is stratification and assortative mating) – Population is large (if appropriately chosen!) – No mutation (but the ...
Hardy Weinberg Principle (equilibrium)
... Allelic frequencies in a gene pool will change due to natural selection of variations. ...
... Allelic frequencies in a gene pool will change due to natural selection of variations. ...
Population Genetics
... phenotype divided by the total number of individuals in the population. • Same principle as allele frequencies • P2 + 2PQ + Q2 = 1 ...
... phenotype divided by the total number of individuals in the population. • Same principle as allele frequencies • P2 + 2PQ + Q2 = 1 ...
Ch 23 Evolution of Populations Guided Rdg
... 8. List the five conditions that must exist for a population to exist in Hardy-Weinberg equilibrium. ...
... 8. List the five conditions that must exist for a population to exist in Hardy-Weinberg equilibrium. ...
Evolution & Speciation
... • Random change in allele frequency causes an allele to become common ...
... • Random change in allele frequency causes an allele to become common ...
Review for Final: Chap 16: Evolulution of Populations
... 13. For evolution to progress to the point where a new species forms, what condition is necessary? ...
... 13. For evolution to progress to the point where a new species forms, what condition is necessary? ...
CHAPTER 11 QUICK LAB
... 1. Shuffle the cards and hold the deck face down. Turn over 40 cards to represent the alleles of 20 offspring produced by random matings in the initial population. 2. Separate the 40 cards by suit. Find the allele frequencies for the offspring by calculating the percentage of each suit. 3. Suppose a ...
... 1. Shuffle the cards and hold the deck face down. Turn over 40 cards to represent the alleles of 20 offspring produced by random matings in the initial population. 2. Separate the 40 cards by suit. Find the allele frequencies for the offspring by calculating the percentage of each suit. 3. Suppose a ...
VOCAB- Evolution
... ADAPTIVE RADIATION (DIVERGENT EVOLUTION) – process by which a single species or small group of species evolves into several different forms that live in different ways; rapid growth in the diversity of a group of organisms. COEVOLUTION- process by which two species evolve in response to changes in e ...
... ADAPTIVE RADIATION (DIVERGENT EVOLUTION) – process by which a single species or small group of species evolves into several different forms that live in different ways; rapid growth in the diversity of a group of organisms. COEVOLUTION- process by which two species evolve in response to changes in e ...
Computer modeling of genetic drift
... • 2. Bottleneck (population is drastically decreased in size -reestablishment of the population by a small number of founders. • Small populations lose genetic variability. • e.g., a gene locus has 25 alleles. Ten individuals found a new population. This allelic variation cannot be fully represented ...
... • 2. Bottleneck (population is drastically decreased in size -reestablishment of the population by a small number of founders. • Small populations lose genetic variability. • e.g., a gene locus has 25 alleles. Ten individuals found a new population. This allelic variation cannot be fully represented ...
Population Genetics 2
... their alleles to next generation, others by chance pass on more than their “fair share” • This effect causes changes in allele frequency between generations - genetic drift • The effect is particularly pronounced in small populations • Given enough time, any allele frequency can drift to 1 (fixation ...
... their alleles to next generation, others by chance pass on more than their “fair share” • This effect causes changes in allele frequency between generations - genetic drift • The effect is particularly pronounced in small populations • Given enough time, any allele frequency can drift to 1 (fixation ...
Genes and Evolution
... The collection of all existing alleles for all genes is the gene pool for the population. Remember that each gene can exist as a number of different alleles. For each gene, the proportion of the total alleles represented by any given allele is the allele frequency for that allele. ...
... The collection of all existing alleles for all genes is the gene pool for the population. Remember that each gene can exist as a number of different alleles. For each gene, the proportion of the total alleles represented by any given allele is the allele frequency for that allele. ...
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.