inheritance and survival
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
Inheritance and Survival
1. Populations2. 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
POPULATION SIZE
POPULATION SIZE
Food
POPULATION SIZE
Food
plenty of food
POPULATION SIZE
Food
plenty of food
population grows
POPULATION SIZE
Food
plenty of food
population grows
food shortage
POPULATION SIZE
Food
plenty of food
population grows
food shortage
population falls
POPULATION SIZE
Food
plenty of food
population grows
food shortage
population fallsdisease
POPULATION SIZE
Food
plenty of food
population grows
food shortage
population fallsdisease
POPULATION SIZE
Food
plenty of food
population grows
food shortage
population fallsdiseaseovercrowding
POPULATION SIZE
Food
plenty of food
population grows
food shortage
population fallsdiseaseovercrowding
increased aggression
POPULATION SIZE
Food
plenty of food
population grows
food shortage
population fallsdiseaseovercrowding
increased aggression
POPULATION SIZE
Food
plenty of food
population grows
food shortage
population fallsdiseaseovercrowding
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
The hare and the lynx
Hare and the LynxMonth number No. of lynx
(thousands)No. of hare (thousands)
036912151821242730
3043820302820761532
2018406869321223467173
Hare and the LynxMonth number No. of lynx
(thousands)No. of hare (thousands)
3336394245485154
45281146132228
5222253538434531
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.
EFFECTS OF AN INCREASING HUMAN POPULATION SIZE
EFFECTS OF AN INCREASING HUMAN POPULATION SIZE
increased food production
EFFECTS OF AN INCREASING HUMAN POPULATION SIZE
increased food production
greater land use
EFFECTS OF AN INCREASING HUMAN POPULATION SIZE
increased food production
greater land use
increased need for fertiliser
eutrophication
EFFECTS OF AN INCREASING HUMAN POPULATION SIZE
increased food production
greater land use
increased need for fertiliser
eutrophication
more factories
EFFECTS OF AN INCREASING HUMAN POPULATION SIZE
increased food production
greater land use
increased need for fertiliser
eutrophication
more factoriesPOLLUTION
more housing
EFFECTS OF AN INCREASING HUMAN POPULATION SIZE
increased food production
greater land use
increased need for fertiliser
eutrophication
more factoriesPOLLUTION
more housing
EFFECTS OF AN INCREASING HUMAN POPULATION SIZE
increased food production
greater land use
increased need for fertiliser
eutrophication
more factoriesPOLLUTION
more housing
need for mobility
EFFECTS OF AN INCREASING HUMAN POPULATION SIZE
increased food production
greater land use
increased need for fertiliser
eutrophication
more factoriesPOLLUTION
more housing
need for mobility
TRANSPORT
EFFECTS OF AN INCREASING HUMAN POPULATION SIZE
increased food production
greater land use
increased need for fertiliser
eutrophication
more factoriesPOLLUTION
more housing
need for mobility
TRANSPORT
EFFECTS OF AN INCREASING HUMAN POPULATION SIZE
increased food production
greater land use
increased need for fertiliser
eutrophication
more factoriesPOLLUTION
more housing
need for mobility
TRANSPORT
EFFECTS OF AN INCREASING HUMAN POPULATION SIZE
increased food production
greater land use
increased need for fertiliser
eutrophication
more factoriesPOLLUTION
more housing
need for mobility
TRANSPORT
Natural selection
The work of Charles Darwin
In the predator-prey battle, what determines who survives?
Natural Selection
Survival of the fittest to REPRODUCE
Individual work
Read page 38 of Further Science
Answer questions 1 to 4 off p38
You have 15 minutes to do this!
Evolution
Read through this sheet and stick it into your books!
Evolution of the horse
A cut out and stick exercise!
The Peppered Moth
This is an example of evolution in action!
Visit http://www.echalk.co.uk/Science/science.htm
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 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 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 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.