February 13th A change in the DNA sequence is known as a___? How can this lead to evolution of a population? The mixing up of DNA in meiosis, which can.

Slides:



Advertisements
Similar presentations
The Five Factors of Evolution
Advertisements

Chapter 16.  What Darwin didn’t know…. ◦ How traits were inherited ◦ What caused variations.
Chapter 17.2: Evolution as Genetic Change in Populations
Heredity and Evolution
From population genetics to variation among species: Computing the rate of fixations.
Populations & Gene Pools and Genetic Variation.
11.1 Genetic Variation Within Population KEY CONCEPT A population shares a common gene pool.
Chapter 19.2 (Pgs ): Patterns and Processes of Evolution
Genes and Variation Presented by: Mr. Godinez What is it?
Population Genetics and Evolution. Darwin’s Observations (review) Galapagos Islands Many similar species had slight differences Favorable variations allow.
Gene flow is the movement of alleles between populations.
AP Biology Evolution of Populations Doonesbury - Sunday February 8, 2004.
MICROEVOLUTION Mechanisms of. POPULATIONS Populations are groups of individuals that can breed with one another and are localized in certain regions.
MECHANISMS OF EVOLUTION
Evolution as Genetic Change and Speciation. A Population’s Gene Pool A gene pool is all the alleles available in all of the individuals in a population.
Genetic Drift Random change in allele frequency –Just by chance or chance events (migrations, natural disasters, etc) Most effect on smaller populations.
CP Biology Ms. Morrison. Genes and Variation  Gene pool = combined genetic information of all members of a particular population  Relative frequency.
Chapter 16 Evolution of Populations. Variation and Gene Pools Genetic variations (differences) are studied in populations (group of individuals of the.
Populations, Genes and Evolution Ch Population Genetics  Study of diversity in a population at the genetic level.  Alleles  1 individual will.
End Show 16-2 Evolution as Genetic Change Slide 1 of 40 Copyright Pearson Prentice Hall Genetic Drift What is genetic drift?
Mechanisms of Evolution & their Effects on Populations.
Lecture 21 Based on Chapter 21 Population Genetics Copyright © 2010 Pearson Education Inc.
Genetic Drift, Bottleneck Effect and Founder Effect.
Evolution Chapter 16 regents. Copyright Pearson Prentice Hall How Common Is Genetic Variation? Many genes have at least two forms, or alleles. All organisms.
AP Biology Evolution of Populations AP Biology Populations evolve  Natural selection acts on individuals  differential survival  “survival.
Evolution. Geologic change Catastrophism: natural disasters shaped landforms and caused species to become extinct Gradualism: landform shaping is the.
Aim: What are population genetics and how do they affect evolution? I. Population Genetics – Genetics today is concerned with inheritance in large groups.
Genes and Variation 16-1 This section describes the main sources of heritable variation in a population. It also explains how phenotypes are expressed.
Fun fact: Humans are one of the least diverse species; fruit flies are 10x as diverse.
11.3 Other Mechanisms of Evolution KEY CONCEPT Natural selection is not the only mechanism through which populations evolve.
Chapter 13 Section 3 and more!. Objectives ▪ Describe an allele. ▪ Identify the five principles of natural selection. ▪ Describe how changes in allele.
14.4 & 14.5 Gene Pools & Evolutionary Biology. Gene Pool Definition- all the alleles of a population. A population -smallest level of evolution. Reservoir.
Put these events in order. A new selective pressure occurs. A pop. contains genetic variation as a result of mutation. Allele (gene) frequencies within.
Genes and Variation Genotypes and phenotypes in evolution Natural selection acts on phenotypes and does not directly on genes. Natural selection.
Evolution is non-random changes in gene and allele frequencies within a population or species. Random changes can be caused by: 1) 2) 3)
EVOLUTION Descent with Modification. How are these pictures examples of Evolution?
Evolution The two most important mechanisms of evolution are
Evolution of Populations
Everybody in the “gene pool”
KEY CONCEPT A population shares a common gene pool.
Mechanisms of Evolution
Evolution of Populations
Genetic Variation within Populations 11.1
Tell me the difference between and all that you know about…
Fossils provide a record of evolution.
Evolution.
KEY CONCEPT A population shares a common gene pool.
Mapping Human History.
Year 10, Pathway C 2012 New Generations.
KEY CONCEPT A population shares a common gene pool.
KEY CONCEPT A population shares a common gene pool.
To be successful today…
How Populations Evolve
Lecture #30: POPULATION & EVOLUTION
7th Chapter 7-3 Cornell Notes
GENE POOL All the genes of all members of a particular population.
KEY CONCEPT A population shares a common gene pool.
CORNELL NOTES: Mechanisms of Evolution
Evolution of Populations 16.1 pp
Mechanisms of Evolution
KEY CONCEPT A population shares a common gene pool.
What evidence do we have for evolution? (5)
Genetic Drift Random changes in allele frequencies that occur in a population. Occurs in small populations with more frequency than in large populations.
KEY CONCEPT A population shares a common gene pool.
15.2 Mechanisms of Evolution
Genetic Variation MT: Allele Frequency.
KEY CONCEPT A population shares a common gene pool.
How Populations Evolve
A population shares a common gene pool.
KEY CONCEPT A population shares a common gene pool.
Presentation transcript:

February 13th A change in the DNA sequence is known as a___? How can this lead to evolution of a population? The mixing up of DNA in meiosis, which can lead to increased genetic variation among a species, is known as___? The introduction of new alleles into a population (through migration) which can lead to a change in the genetic make up of that population is known as? What example of genetic drift occurs when a natural disaster destroys a large portion of the population, and the new population no longer reflects what the original population was like? What example of genetic drift occurs when members of a population move to a new habitat and after years, the new population no longer reflects what the original pop was like?