There are three general outcomes of natural selection Number of individuals Original population Phenotypes (fur color) Original population Evolved population.

Slides:



Advertisements
Similar presentations
Natural Selection 1. Do we see the same variation within different wild species that we do in domesticated ones like dogs, pigeons and horses?
Advertisements

Natural Selection the process whereby organisms better adapted to their environment tend to survive and produce more offspring It is a two step process:
Evolution of Populations
Chapter 16: Evolution of Populations
Chapter 16.  What Darwin didn’t know…. ◦ How traits were inherited ◦ What caused variations.
Natural Selection It is a two step process:
16-1 Genes and Variation In genetic terms, evolution is any change in the relative frequency of alleles in a population. Gene pool is the combined genetic.
Lesson Overview 17.1 Genes and Variation.
Modern View of Evolution: Genetic Change. Genes and Variation.
Main Points of Darwin’s Theory of Natural Selection
BIG IDEA 1: Evolution Evolution as a Process Selection as a Mechanism Evidence for Evolution HW Equilibrium Speciation Origin of Life.
Exploring Darwin & His Ideas  Think about the following questions: –What explains the explosion of living creatures on Earth—1.4 million different species.
Theory of Evolution. Evolution Inherited change over time, eventually causing creation of new species. Inherited change over time, eventually causing.
Evolution EVOLUTION OF POPULATIONS. Three Cases of Variation What specifically causes the change in each of these populations of organisms:What specifically.
TYPES OF NATURAL SELECTION.  Directional Selection  Stabilizing Selection  Disruptive Selection DEFINE IN YOUR NOTES.
Main Points of Darwin’s Theory of Natural Selection 1.Over production. Most organisms produce more offspring than can survive. 2.Competition. Organisms.
Warm Up Which process is responsible for bacteria becoming increasingly resistant to antibiotics (medicine that kills bacteria)? (Hint: Think.
Chapter 16 Notes Spring 2006 Mr. Holmes.  Darwin’s problem was that he did not understand inheritance. Although Mendel’s work was published during Darwin’s.
EVOLUTIONEVOLUTIONEVOLUTIONEVOLUTION. Questions to Ponder TRUE/FALSE 1. You can web your hands if you try. 2. You can acquire traits in your lifetime.
Chapter 16 Evolution of Populations. Ch. 16 Evolution of Populations 16–1Genes and Variation A.How Common is Genetic Variation? –Most genes have two forms.
How Populations Evolve  Jean-Baptiste Lamarck  Traits acquired during lifetime are inheritable  Charles Lyell  Geologic change is the steady accumulation.
11.2 Natural Selection in Populations KEY CONCEPT Populations, not individuals, evolve.
The gene pool. The Gene Pool The total number of genes of every individual in a population. Th is could be all the genes for all traits but we usually.
Evolution of Populations Chapter 16. Genetic Variation Heterozygotes make up between 4-8% in mammals and 15% in insects. The gene pool is total of all.
Please Do Now: 1) List the 3 types of selection 2) Do your best to explain what those three words mean.
Exploring Darwin & His Ideas  Think about the following questions: –What explains the explosion of living creatures on Earth—1.4 million different species.
Darwin vs. Lamarck. Lamarck Darwin Jean-Baptiste LaMarck French, Early 1800’s Theory of Inheritance of Acquired Characteristics Two main points…
GENETIC EVOLUTION. Gene Pool All genetic information from a population of a specific species.
Go to Section: Interest Grabber Yes, No, or Maybe Some traits, such as a widow’s peak, fall into neat categories: You either have a widow’s peak or you.
Evolution as Genetic Change
KEY CONCEPT Populations, not individuals, evolve.
Interest Grabber Yes, No, or Maybe
Add to table of contents
Evolution of Populations
Happy Mondays! 2/13/17 Which scientist proposed that organisms “acquired traits” throughout their lifetime, and then passed those traits on to their.
Interest Grabber Yes, No, or Maybe
Natural Selection The unequal survival and reproduction of organisms due to environmental forces, resulting in the preservation of favorable adaptations.
Natural Selection It is a two step process:
TYPES OF NATURAL SELCTION
Origin of Life.
Genetic Variations with Populations
KEY CONCEPT Populations, not individuals, evolve.
Natural Selection It is a two step process:
KEY CONCEPT Populations, not individuals, evolve.
KEY CONCEPT Populations, not individuals, evolve.
Natural Selection & Phenotype
Natural Selection It is a two step process:
Mechanisms of Evolution, cont.
KEY CONCEPT Populations, not individuals, evolve.
Mechanisms of Evolution, cont.
Bellringer-5/14/15 What does it mean to be the “fittest” individual?
Types of Selection.
Natural Selection It is a two step process:
Interest Grabber Yes, No, or Maybe
Bell-Ringer: 2/10-PHONES AWAY
Evolution as Genetic Change
Mechanisms of Evolution, cont.
KEY CONCEPT Populations, not individuals, evolve.
Types of Natural Selection
Natural selection in populations & Other mechanisms of Evolution
More on Natural Selection Bio Standard 8a, 7a, b, and c
Evolution of Populations
p. 33 – Mechanisms of Evolution
Discussion of Natural Selection Lab
Summary – one summary at the end
The student is expected to: 7C analyze and evaluate how natural selection produces change in populations, not individuals; 7D analyze and evaluate how.
Genes, Variation & Change in Populations
WATCH Natural Selection Animation.
Add to table of contents
KEY CONCEPT Populations, not individuals, evolve.
Presentation transcript:

There are three general outcomes of natural selection Number of individuals Original population Phenotypes (fur color) Original population Evolved population Stabilizing selectionDirectional selectionDisruptive selection

Original Population TALLSHORT INTERMEDIATE BELL CURVE

Directional Selection Neck of Giraffe Moth color (melanin) Camouflage/Mimicry

Stabilizing Selection When the extremes of the trait aren’t as well suited Examples bird clutch size Human birth weight Human height

Disruptive Selection Causes divergence within the species Occurs when two different types of resources in one area Results in specialization for each branched group May lead to formation of new species E.g. Darwin’s Finches

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2024 SlidePlayer.com Inc. All rights reserved.