Causes of Evolution
... Types of Natural Selection 1. STABILIZING Selection = favors average individuals in a population • reduces variation in organisms Ex: lizards – large captured easily & small cannot run fast enough 2. DIRECTIONAL Selection = favors one of the extreme variations of a trait • can lead to rapid evolutio ...
... Types of Natural Selection 1. STABILIZING Selection = favors average individuals in a population • reduces variation in organisms Ex: lizards – large captured easily & small cannot run fast enough 2. DIRECTIONAL Selection = favors one of the extreme variations of a trait • can lead to rapid evolutio ...
Mechanisms of Evolution
... What drives this ‘speciation’? ISOLATING MECHANISMS • Behavioral• Geographical• Temporal- ...
... What drives this ‘speciation’? ISOLATING MECHANISMS • Behavioral• Geographical• Temporal- ...
Bio Chp 15.2 Page 1
... 9. Any factor that affects phenotype can change allelic frequencies, thereby disrupting the genetic equilib- ...
... 9. Any factor that affects phenotype can change allelic frequencies, thereby disrupting the genetic equilib- ...
Biology Quiz 2 Answers and explanations Note there were two forms
... weeds could become resistant, therefore the product would no longer be effective, and 2) genetic diversity of the weeds could decrease after continued selection. This was an analogous example to bacteria and selection by antibiotics. A third possibility exists (but not an answer on the quiz); no evo ...
... weeds could become resistant, therefore the product would no longer be effective, and 2) genetic diversity of the weeds could decrease after continued selection. This was an analogous example to bacteria and selection by antibiotics. A third possibility exists (but not an answer on the quiz); no evo ...
More Evolution and Hardy Weinberg! KEY
... Individuals that have been isolated, they evolve based on the environment 4. True or false: Genetic drift can cause allele frequencies to change randomly: True Genetic drift can lead to loss of genetic variation: True Genetic drift can cause harmful alleles to become fixed: True 5. What is gene flow ...
... Individuals that have been isolated, they evolve based on the environment 4. True or false: Genetic drift can cause allele frequencies to change randomly: True Genetic drift can lead to loss of genetic variation: True Genetic drift can cause harmful alleles to become fixed: True 5. What is gene flow ...
15.2 PDQ - Biology with Radjewski
... 2. Explain, “natural selection acts on individuals, but populations evolve” • Changes that occur are developmental in a single organism over the course of a life cycle. • After breeding populations will evolve ...
... 2. Explain, “natural selection acts on individuals, but populations evolve” • Changes that occur are developmental in a single organism over the course of a life cycle. • After breeding populations will evolve ...
Mechanisms of Evolution
... • A change in the population because of a random event, such as a catastrophe • The smaller the population, the less genetic variety it has. • 2 Types: ...
... • A change in the population because of a random event, such as a catastrophe • The smaller the population, the less genetic variety it has. • 2 Types: ...
Population genetics
Population genetics is the study of the distribution and change in frequency of alleles within populations, and as such it sits firmly within the field of evolutionary biology. The main processes of evolution (natural selection, genetic drift, gene flow, mutation, and genetic recombination) form an integral part of the theory that underpins population genetics. Studies in this branch of biology examine such phenomena as adaptation, speciation, population subdivision, and population structure.Population genetics was a vital ingredient in the emergence of the modern evolutionary synthesis. Its primary founders were Sewall Wright, J. B. S. Haldane and Ronald Fisher, who also laid the foundations for the related discipline of quantitative genetics.Traditionally a highly mathematical discipline, modern population genetics encompasses theoretical, lab and field work. Computational approaches, often utilising coalescent theory, have played a central role since the 1980s.