Stabilizing selection - PowerPoint PPT Presentation

General and BioChem

General and BioChem

General and BioChem. DNA and RNA. Body Systems. Genetics. Evolution. Cells. Gen/BioChem. DNA/RNA. Body Systems. Genetics. Evolution. Cells. $100. $100. $100. $100. $ 100. $100. $200. $200. $200. $200. $200. $200. $300. $300. $300. $300. $300. $300. $400. $400.

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Evolution

Evolution

Evolution. Biology RiverDell High School Ms. C. Militano. I. Evidence of Evolution A. Fossils. 1. definition - trace or remains of organisms that are preserved 2. types a. mold (rock imprint) b. cast (mold that is filled) c. petrified

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Chapter 16 Evolution of Populations

Chapter 16 Evolution of Populations

Chapter 16 Evolution of Populations. Two main sources of genetic variation. Mutations—change in genes (DNA sequence) or chromosomes Gene recombination—mixing of genes that result from meiosis and sexual reproduction.

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Chapter 15 Notes, Natural Selection and the Theory of Evolution

Chapter 15 Notes, Natural Selection and the Theory of Evolution

Chapter 15 Notes, Natural Selection and the Theory of Evolution. Darwin's Voyage. In 1831, a young amateur naturalist by the name of Charles Darwin traveled on a ship called the HMS Beagle . On his voyage, he collected specimens of rocks, fossils, animals, and plants .

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Sasha Gimelfarb died on May 11, 2004

Sasha Gimelfarb died on May 11, 2004

Sasha Gimelfarb died on May 11, 2004. Reinhard Bürger Department of Mathematics, University of Vienna. A Multilocus Analysis of Frequency-Dependent Selection on a Quantitative Trait. Frequency-dependent selection. has been invoked in the explanation of evolutionary phenomena such as

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Evolution & Natural Selection Cornell Notes

Evolution & Natural Selection Cornell Notes

Evolution & Natural Selection Cornell Notes. EQ: How Does Natural Selection Influence Evolution? Phoenix Union Curriculum Guide Essential Standard 6.2 Analyze how a change in an environmental factor can affect the number and diversity of individuals in a population (natural selection).

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1.52k views • 32 slides
AP ENVS

AP ENVS

AP ENVS. THURS DEC 19 2013. THE VOCABULARY OF EVOLUTION. Population Selection pressure Adaptation/Adaptive trait Genetic variation Mutation Directional selection Stabilizing selection Disruptive selection Divergent evolution Convergent evolution Artificial selection Speciation

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Ch 16: Evolution of Population

Ch 16: Evolution of Population

Ch 16: Evolution of Population. Notes # 3. What makes up a Population?. ANS: Organisms that belong to the same species and live in the same area. Human Population in Alhambra. Total Population: 85, 077. What is a Species?.

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Adaptation and levels of selection

Adaptation and levels of selection

Adaptation and levels of selection. What is an adaptation? What is natural selection? On what does selection act?. What is an adaptation?. A feature designed to improve survival and/or reproduction of an organism (or other entity)

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872 views • 26 slides
Evolution of Populations

Evolution of Populations

Evolution of Populations. Populations are the units of evolution. Population. A group of individuals of the same species living in the same place at the same time. Species. A group of populations whose members are capable of interbreeding and producing fertile offspring.

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405 views • 26 slides
Evolution and Biodiversity

Evolution and Biodiversity

Evolution and Biodiversity. Concepts. Origins. Evolutionary Processes. Ecological Niches. Species Formation. Species Extinction. Origins and Early Evolution of Life. Chemical evolution. Biological evolution. Stanley Miller's experiment animation. Click to view animation. Animation.

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609 views • 26 slides
11,12,13

11,12,13

11,12,13. Each one of the conditions required to maintain Hardy-Weinberg equilibrium is violated !. Are all populations large? Although many populations are, some are small enough for random events to change gene frequencies. This microevolutionary phenomena is called genetic drift .

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427 views • 25 slides
EVIDENCE OF EVOLUTION

EVIDENCE OF EVOLUTION

EVIDENCE OF EVOLUTION. I. FOSSILS USUALLY FOUND IN SEDIMENTARY ROCK LAYERS. “OLD AT THE BOTTOM & NEW AT THE TOP!”. II. EVIDENCE IN LIVING ORGANISMS. A. DNA, RNA, & ATP ARE SIMILAR BETWEEN ALL SPECIES. B. HOMOLOGOUS STRUCTURES:.

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367 views • 24 slides
Natural and Artificial Selection

Natural and Artificial Selection

Natural and Artificial Selection. Grade 11 Biology SBI3U. Adaptation. A characteristic or feature of a species that makes it well suited for survival or reproductive success in its environment. Adaptation. Explains why the cactus can be successful in the desert. Survival of the Fittest.

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Evolutionary Concepts

Evolutionary Concepts

Evolutionary Concepts. Types of Selection Types of Evolution Rate of Evolution. Natural Selection & Populations. Review: Natural selection can affect the distribution of phenotypes in populations

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Natural Selection and Speciation

Natural Selection and Speciation

Natural Selection and Speciation. Stabilizing Selection. favors the average individual reduces variation in a population. Examples. birth weight in humans Siberian husky- muscle mass “living fossils”- organisms that have remained unchanged for millions of years (sharks, crocs).

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Section 15.2 Summary– pages 404-413

Section 15.2 Summary– pages 404-413

SPECIATION. Section 15.2 Summary– pages 404-413. What is a species ?. a group of organisms that look alike and can interbreed to produce fertile offspring in nature. The evolution of new species, a process called speciation . -But HOW are new species made?. Tree Kangaroo! ->.

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Today’s Objectives: 10/21/02

Today’s Objectives: 10/21/02

Today’s Objectives: 10/21/02. TSW be able to write the Hardy-Weinberg equation and explain it. TSW be able to list several evolutionary mechanisms. TSW be able to list several types of speciation and discuss the rates of evolution. Hardy-Weinberg Theorem. p 2 + 2pq + q 2 = 1

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Natural, Sexual and Artificial Selection

Natural, Sexual and Artificial Selection

Natural, Sexual and Artificial Selection. Directional, Disruptive and Stabilizing Selection. Directional Selection. An extreme phenotype is favored A trait that was once rare becomes more common. Stabilizing Selection. An intermediate phenotype is favored There is less genetic variation

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III. A Closer Look at Natural Selection A. Natural selection, adaptation, and evolution

III. A Closer Look at Natural Selection A. Natural selection, adaptation, and evolution

III. A Closer Look at Natural Selection A. Natural selection, adaptation, and evolution B. Patterns of natural selection 1. Directional selection 2. Stabilizing selection 3. Diversifying selection C. Effects of selection on the distribution of phenotypes. aa. aa. aa. AA.

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440 views • 5 slides

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