'New alleles' diaporamas de présentation

Chapter 23: The Evolution of a Population

Chapter 23: The Evolution of a Population. Population. Group of individuals in a geographic location, capable of interbreeding and producing fertile offspring. Natural selection acts on individuals, but only populations evolve. Galapagos Islands.

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Chapter 14

Chapter 14. Molecular Oncology. Objectives. Contrast tissue-specific and tumor-specific molecular targets. List molecular targets that are useful for diagnosis and the monitoring of solid tumors. Explain how microsatellite instability is detected.

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Blueprint of Life Topic 19: Mutations

Blueprint of Life Topic 19: Mutations. Biology in Focus, HSC Course Glenda Childrawi , Margaret Robson and Stephanie Hollis. DOT POINT(s). discuss evidence for the mutagenic nature of radiation explain how mutations in DNA may lead to the generation of new alleles

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Evolution of Populations

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Evolution as Genetic Change

Evolution as Genetic Change. 16.2 Evolution as Genetic Change. Natural selection can affect phenotypes in a population in 3 ways Directional Selection Stabilizing Selection Disruptive Selection. Higher fitness at ONE END of curve than at the other

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Biodiversity

Biodiversity. Diversity Video. Why should Humans (at the top of the Hierarchy of Living things) care about those below?. Species Diversity. Scientists have identified 1.75 million different species of organisms. The actual number may be 10 times more. This is Biodiversity.

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Adaptation and Evolution

Adaptation and Evolution. Evolution is the change in the inherited traits of a population of organisms through successive generations Two factors at work: Processes that constantly introduce variation in traits Processes that make particular variants become more common or rare. Evolution.

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The Evolution of Populations

The Evolution of Populations. Populations. It is a common misconception that evolution happens to one organism over the course of their lifetime Remember adaptations have to be inherited Natural selection overall affects the populations of organisms that are in a particular habitat.

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Variation in Natural Populations

Variation in Natural Populations. Overview of Evolutionary Change. Natural Selection : variation among individuals in heritable traits lead to variation among individuals in reproductive success Evolution : change in genetic composition of a population over time.

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UNIT 3 - EVOLUTION

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Section 9.1: Mechanisms of Evolution and Effect on Populations

Section 9.1: Mechanisms of Evolution and Effect on Populations. SBI3U1. Evolution of the population. Although individual organisms with a selective advantage survive and reproduce, it is the populations that evolves not the individual organism.

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NATURAL SELECTION

NATURAL SELECTION. http://www.youtube.com/watch?v=nS1tEnfkk6M. ***READ 8.1***. Types of Selection. Directional Selection: when selection favour individuals with a more extreme variation of a trait; selection that favours an increase or decrease in the

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A Hardy Weinberg

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Mechanisms of Evolution

Mechanisms of Evolution. Mechanisms of Evolution. There are several: Natural Selection Gene Flow Genetic drift Mutations Non-random mating. 1. Natural Selection:.

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Recombination, Mutation, Genetic Drift, Gene Flow

Recombination, Mutation, Genetic Drift, Gene Flow. Also evolution ?. Recombination. Remember Meiosis? This is when recombination occurs Shuffling of chromosomes/genes/alleles Also crossing over Remember fertilization? Coming together of shuffled genes New alleles not created, just

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Population Changes

Population Changes . Natural Selection. Natural Selection. Multiple observations that life has changed over generations. What was missing was a mechanism of explaining HOW organisms changed.

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Population and Speciation

Population and Speciation. Population Genetics: The study of Evolution from a genetic point of view. Variations of Traits. Biologists measure traits in large samples when studying variation.

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CELL DIVISION

Atypical or Abnormal Cell Division. CELL DIVISION. Mitosis Gone Awry. Mutations are changes in the molecular structure of DNA that ultimately creates diversity Carcinogens , radiation viruses and other factors can all cause mutations. http://www.youtube.com/watch?NR=1&v=Hm03rCUODqg.

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Evolution Vocabulary

Evolution Vocabulary. Evolution. Evolution is defined biologically as: descent with modification AKA a genetic change in a population over time. Important Concepts to understand: Evolution as defined above does not happen in individuals- it happens to populations

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1) mutations

1) mutations. A) occur randomly with respect to fitness effects, but non-randomly in a biochemical sense B) occur very rarely on a per-organism/generation basis C) can produce new alleles of existing genes, but not new genes D) usually increase organism fitness E) all of the above.

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