SPECIATION Ch. 16-3 pp. 326-330.

Slides:



Advertisements
Similar presentations
Chapter 24 Species & Speciation.
Advertisements

THE ORIGIN OF SPECIES CHAPTER 24.
Formation of Species A species is a population of organisms that can successfully interbreed but cannot breed with other groups. Existing species are changed.
Speciation.
Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring.
Speciation. Species: A group of organisms capable of interbreeding = they are isolated reproductively from other species 1)Live together but cannot interbreed.
THE ORIGIN OF SPECIES. HOW DOES EVOLUTION LEAD TO THE FORMATION OF ALL THE DIFFERENT ORGANISMS, OR SPECIES, WE SEE ON THE PLANET? FIRST WE MUST DEFINE.
Ch. 24 – The Origin of Species
The Formation of New Species. Isolation of Subpops  Mechanisms of evolution cause isolated subpops to diverge.
SPECIATION Ch pp Warm up 2/25:
Outstanding Origin of Species Ch 24. Vocabulary  1. Macroevolution – origin of new taxonomic groups (new species, genera, families etc)  2. Speciation.
AP Biology The Origin of Species AP Biology “That mystery of mysteries…” Darwin never actually tackled how new species arose… Both in space.
Formation of species. The process of species formation is called? Speciation Scientists use internal and external structures and appearances ( morphology.
Formation of Species Section 3.
Lecture #41 Origin of Species
What is a Species? Speciation – the origin of new species The biological species concept defines a species as a population or group of populations whose.
Speciation and Evolution
Speciation How Species Form. Species How are new species defined? Used to be on basis of structure These are different species: –Top: Grevy’s zebra (endangered)
Semester 2, Day 12 Fossil Evidence of Evolution. Homework Due  Cornell Notes on 14.3 and 14.4  Questions:  14.3 #1-3  14.4 #1-5  Chapter 14 Assessment.
Process of Speciation. –In the 150 years since the publication of Darwin’s book On the Origin of Species by Means of Natural Selection, new discoveries.
1 Origin of Species Chapter What you need to know! The difference between microevolution and macroevolution. The biological concept of species.
ORIGIN OF SPECIES CH 24. Speciation: origin of new species Microevolution: changes in allele frequencies Macroevolution: changes that result in formation.
The Origin of Species Chapter 24 Bozeman Tutorial: SpeciationBozeman Tutorial: Speciation (11:39)
Lesson # 8: Evolution (Speciation). Introductory Terms - In order for one population to become very different from another, they must be reproductively.
Speciation. Speciation is the origin of new species  A species is a population or group of populations whose members have the potential to interbreed.
The Origin of the Species Chapter 22 Mom, Dad… There’s something you need to know… I’m a MAMMAL!
Speciation. What is a species? Biological species concept – a population or group of populations whose members have the potential to interbreed in nature.
Speciation.
SPECIATION Ch pp Warm up 3/2: Define: Homologous Structures, Analogous Structures and Vestigial Organs/Structures. Give 1 example of each.
Origin of Species Chapter 24. What you need to know!  The biological concept of species.  The difference between microevolution and macroevolution.
Mom, Dad… There’s something you need to know… I’m a MAMMAL! The Origin of Species.
Speciation Where do species come from?
Macroevolution & Speciation
The Origen of Species Ch 24.
Speciation Changes in allele frequency are so great that a new species is formed Can be slow and gradual or in “bursts” Extinction rates can be rapid and.
Objective: to be able to explain how a species originates
Measure the length of your hand in cm.
SPECIATION UNIT 5 EVOLUTION.
The origin of species is the source of biological diversity
The Origin of Species Chapter 24.
Speciation Geographic isolation of populations
9.2-Speciation: How Species Form
Hardy- Weinberg Equilibrium
Do Now Explain the difference between directional and disruptive selection. Directional – one extreme of the variation of the trait is most fit Disruptive.
Speciation How species evolve.
The Origin of Species.
Evolution OF NEW SPECIES
Evolution and Zygotic Barriers (Part 5)
The Creation of New Species Through Evolution
The Origin of Species.
Speciation Changes in allele frequency are so great that a new species is formed Can be slow and gradual or in “bursts” Extinction rates can be rapid and.
Evolution and Zygotic Barriers
Chapter 24 – The Origin of Species
Reproductive Barriers
Evolution OF NEW SPECIES
Evolution and Speciation
Conditions that Disrupt Hardy Weinberg Equilibrium
Speciation… How new species form!.
Chapter 22 Bozeman Tutorial: Speciation (11:39)
SPECIATION pp
Macroevolution Speciation.
Chapter 24 Notes The Origin of Species.
Speciation Friday.
Formation of Species Speciation.
Formation of Species 16.3 pp
There’s something you need to know…
SPECIATION Ch pp
Speciation Chapter 24.
Population Genetics & Speciation
Population Genetics Population: a group of organisms of the same species living together in a given region and interbreeding. Allele: Different forms of.
Presentation transcript:

SPECIATION Ch. 16-3 pp. 326-330

Forming a new species Speciation: forming a new species

Forming a new species Speciation: forming a new species Species: a group of organisms that can mate and produce fertile offspring

Forming a new species Speciation: forming a new species Species: a group of organisms that can mate and produce fertile offspring 1. same number of chromosomes 2. similar morphology (body structure)

Disruptive Selection Divergent evolution that most likely results in two new species

Mechanisms Allopatric speciation caused by geographic isolation

Mechanisms Allopatric speciation caused by geographic isolation physical separation of organisms (mountain, river forms etc)

Mechanisms Cont. Sympatric Speciation due to reproductive isolation

Mechanisms Cont. Sympatric Speciation due to reproductive isolation Live in the same area Barriers to successful breeding

Mechanisms Cont. Two types of Sympatric Speciation Barriers Prezygotic: before fertilization (i.e breeding times, mating calls or home range etc)

Mechanisms Cont. Two types of Sympatric Speciation Barriers Prezygotic: before fertilization (i.e breeding times, mating calls or home range etc) Postzygotic: after fertilization- infertile offspring (chromosome # doesn’t add up)

Rates of Speciation Gradualism: slow divergence (small changes) Punctuated equilibrium: sudden shift in form (irregular)

Pre or Postzygotic? offspring die young when two species of salamanders mate – they do not make it to maturity

Pre or Postzygotic? Two different species of birds have different mating calls so they cannot recognize each other as mates

Pre or Postzygotic? garter snakes that live in water and one on land cannot mate although they live in the same geographic area

Pre or Postzygotic? mules are produced by mating a horse and a donkey, but mules are sterile and cannot breed

Pre or Postzygotic? if gametes of red and purple sea urchins do not fuse, there will be no zygote produced

Pre or Postzygotic? although some strains of cultivated rice can be cross-mated, after a few generations, sterile offspring are created