4 Factors Required for Natural Selection

Slides:

Advertisements

Similar presentations

By: Laura Johns Insects Legs Land World Eggs.

Advertisements

The Five Factors of Evolution

1. Variation 2. Selection 3. Heredity 2  Variation exists in all populations  (Siblings look similar…but not identical)  Causes of variation  Mutations.

In your own words, provide the essential points of Charles Darwin’s theory of evolution by natural selection (descent with modification).

DARWIN. DESCENT WITH MODIFICATION All species of organisms living on Earth today are descended from ancestral species All species of organisms living.

KEY CONCEPT Natural selection is not the only mechanism through which populations evolve. Five factors that can lead to evolution.

Study Guide Review!!!! Also use the Vocabulary Review PPT to help understand these important evolution concepts.

Modern Evolutionary Theory. Darwin and Mendel Supports Darwin’s concepts of variation and natural selection Explains the genetic basis for variations.

Natural Selection A Big Idea! (new handout is page 27 ½)

Several key insights led to Darwin’s idea for natural selection.

15-1 Notes: Adaptations and Natural Selection

EVOLUTION NATURAL SELECTION.

Natural Selection: the mechanism for evolution. Charles Darwin (1809 – 1882) I have called this principle, by which each slight variation, if useful,

Have your clickers ready!. 1. Could be 2. Maybe 3. Hope so 4. Kitty!

Types of Reproduction Asexual Sexual. Purpose of Reproduction To make sure a species can continue. –Definition: Reproduction is the process by which an.

The Evolution of Populations. Populations A group of organisms of the same species living in the same area at the same time A population of water buffalo.

EVOLUTION and NATURAL SELECTION Explaining the UNITY and DIVERSITY of LIFE.

TYPES OF. ASEXUAL REPRODUCTION Only one parent Offspring all look the same as the parents No variation in the offspring Not good chance of surviving.

The Theory of Natural Selection Artificial Selection Humans selected (not naturally) traits thought to be advantageous Humans created diversity choosing.

The Theory of Natural Selection

Darwin’s Theory of Evolution by Natural Selection.

8-5 Notes: Natural Selection. SO HOW DID ORGANISMS BECOME SO WELL ADAPTED TO THEIR ENVIRONMENT?

Darwin’s Evolution A Theory of Evolution. How did the giraffe get its long neck ? Lamarck had an idea… Lamarck had an idea… Organisms acquire traits.

Darwin’s Theory of Evolution. What is Darwin’s Theory of Evolution? Introduced the idea that the environment (nature) selects an organisms traits – Natural.

Nyariah Bradshaw Lucas Savchak.  1 Egg  2 Larva  3 Pupa  4 Full Grown lady bug.

Natural Selection.

Theory of Evolution by Natural Selection

TYPES OF REPRODUCTION.

The Process of Natural Selection

Natural Selection Lab 14.

Natural Selection and Adaptation Notes…page 53

Mechanisms of Evolution

Slide # 2 Important Vocabulary 1. Fit or Fitness: success at surviving & reproducing 2. Gene Pool: all alleles (forms of genes) shared within a species.

V. How Does Evolution Work?

Sexual vs Asexual Reproduction

The Theory of Natural Selection

Darwin’s Points Page 71 We will be writing down 6 points of the theory of natural selection and 3 different types of adaptations.

Adaptation and Variation

The Theory of Natural Selection

Natural Selection and Adaptation…54

Natural Selection.

Theories to explain Evolution

I can explain how natural selection causes changes within a population

What has caused SUPERBUGS (antibiotic resistant bacteria) like MRSA?

September Journal: What is a theory? Are theories always true?

Foldable Notes for Evolution, Natural Selection, Variation & Adaptation Megonigal

This is Evolution.

Factors that Affect the Process of Evolution

Evolution of Populations

Biology- study of life Organism- living thing

Several key insights led to Darwin’s idea for natural selection.

Several key insights led to Darwin’s idea for natural selection.

The change over time in a population is Evolution

Summary of Evolution by Natural Selection

Topic 5: Ecology and Evolution

Slide # 2 Important Vocabulary 1. Fit or Fitness: success at surviving & reproducing 2. Gene Pool: all alleles (forms of genes) shared within a species.

Natural Selection SPI Analyze data on levels of variation within a population to make predictions about survival under particular environmental.

Natural Selection and Adaptation…53

Natural Selection.

Mechanisms of Natural Selection and Evolution

The Theory of Natural Selection

Vocab #21 Mr. Addeo.

A Big Idea! (new handout is page 27 ½)

V. How Does Evolution Work?

SURVIVAL OF THE FITTEST

Evolution of Populations

DO NOW Wednesday March 26th, 2019 STANDARD.

Aim: What are the main ideas of Darwin’s theory of natural selection

Fishy Frequencies.

Presentation transcript:

4 Factors Required for Natural Selection

1. Variation Diversity in a population by random mutations

2. Overpopulation More offspring are born than can survive They may lay from 200 to 2000 eggs in a single week in the water. A lot of the eggs and tadpoles do not survive due to fish eating on them.

3. Selection Pressure Survival depending on fitness/adaptations The struggle for survival

4. Time Evolution takes a long time because mutations are random and have to be advantageous

Natural Selection Lab