Inheritance and survival
Download
1 / 41

Inheritance and Survival - PowerPoint PPT Presentation


  • 97 Views
  • Uploaded on

Inheritance and Survival. Populations Evolution. Learning objectives. To understand the factors that influence population size To appreciate the predator-prey relationship To know about the effects of an increasing human population To understand the principles of natural selection.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Inheritance and Survival' - jovan


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Inheritance and survival

Inheritance and Survival

Populations

Evolution


Learning objectives
Learning objectives

  • To understand the factors that influence population size

  • To appreciate the predator-prey relationship

  • To know about the effects of an increasing human population

  • To understand the principles of natural selection



Food

POPULATION SIZE


plenty of food

Food

POPULATION SIZE


population grows

plenty of food

Food

POPULATION SIZE


population grows

plenty of food

food shortage

Food

POPULATION SIZE


population grows

plenty of food

food shortage

Food

POPULATION SIZE

population falls


population grows

plenty of food

food shortage

Food

POPULATION SIZE

population falls

disease


population grows

plenty of food

food shortage

Food

POPULATION SIZE

population falls

disease


population grows

plenty of food

food shortage

Food

POPULATION SIZE

population falls

overcrowding

disease


population grows

plenty of food

food shortage

Food

POPULATION SIZE

population falls

overcrowding

disease

increased aggression


population grows

plenty of food

food shortage

Food

POPULATION SIZE

population falls

overcrowding

disease

increased aggression


population grows

plenty of food

food shortage

Food

POPULATION SIZE

population falls

overcrowding

disease

increased aggression

What happens when we think about this issue with a view to humans? What effects have we had on disease and food shortage? Does this explain the continued existence of war?


Predator prey relationships
Predator – Prey Relationships

  • The hare and the lynx




Hare and lynx
Hare and Lynx

  • Plot the information on the population sizes of the hare and the lynx onto a single graph to show the relationship between the populations of predator and prey.



increased food production

EFFECTS OF AN INCREASING HUMAN POPULATION SIZE


greater land use

increased food production

EFFECTS OF AN INCREASING HUMAN POPULATION SIZE


increased need for fertiliser

eutrophication

greater land use

increased food production

EFFECTS OF AN INCREASING HUMAN POPULATION SIZE


increased need for fertiliser

eutrophication

more factories

greater land use

increased food production

EFFECTS OF AN INCREASING HUMAN POPULATION SIZE


increased need for fertiliser

eutrophication

POLLUTION

more factories

greater land use

increased food production

EFFECTS OF AN INCREASING HUMAN POPULATION SIZE

more housing


increased need for fertiliser

eutrophication

POLLUTION

more factories

greater land use

increased food production

EFFECTS OF AN INCREASING HUMAN POPULATION SIZE

more housing


increased need for fertiliser

eutrophication

POLLUTION

more factories

greater land use

increased food production

EFFECTS OF AN INCREASING HUMAN POPULATION SIZE

more housing

need for mobility


increased need for fertiliser

eutrophication

POLLUTION

more factories

greater land use

increased food production

EFFECTS OF AN INCREASING HUMAN POPULATION SIZE

TRANSPORT

more housing

need for mobility


increased need for fertiliser

eutrophication

POLLUTION

more factories

greater land use

increased food production

EFFECTS OF AN INCREASING HUMAN POPULATION SIZE

TRANSPORT

more housing

need for mobility


increased need for fertiliser

eutrophication

POLLUTION

more factories

greater land use

increased food production

EFFECTS OF AN INCREASING HUMAN POPULATION SIZE

TRANSPORT

more housing

need for mobility


increased need for fertiliser

eutrophication

POLLUTION

more factories

greater land use

increased food production

EFFECTS OF AN INCREASING HUMAN POPULATION SIZE

TRANSPORT

more housing

need for mobility


Natural selection

Natural selection

The work of Charles Darwin



Individual work
Individual work

  • Read page 38 of Further Science

  • Answer questions 1 to 4 off p38

  • You have 15 minutes to do this!


Evolution
Evolution

  • Read through this sheet and stick it into your books!


Evolution of the horse
Evolution of the horse

  • A cut out and stick exercise!


The peppered moth
The Peppered Moth

  • This is an example of evolution in action!

  • Visit http://www.echalk.co.uk/Science/science.htm


The peppered moth1
The Peppered Moth

  • Before the industrial revolution our environment was largely soot free.

  • Occasionally a “dark” form of the peppered moth appeared by mutation.


The peppered moth2
The Peppered Moth

  • Birds prey on peppered moths

  • In a soot free habitat the light form was well camouflaged.

  • The dark form tended to be preyed upon


The peppered moth3
The Peppered Moth

  • Industrial air pollution killed lichens and darkened tree trunks and walls

  • The dark moth was now better camouflaged.

  • The population turned from being mainly light to mainly dark.


The peppered moth4
The Peppered Moth

  • Since the passage of the Clean Air Act in the 1950’s, industrial pollution has reduced and so the proportions of light and dark varieties has changed again.


ad