Unit 1

Darwin’s big ideasand ways of working

Darwin’s big ideas and ways of working: Unit 1Darwin’s big ideas and ways of working: Unit 1

High ratio of increase and Struggle for life

Darwin’s weed patch experiment

Darwin’s big ideas and ways of working: Unit 1Darwin’s big ideas and ways of working: Unit 1

High ratio of increase and Struggle for life

Darwin’s big ideas and ways of working: Unit 1

http://www.arkive.org/common-frog/rana-temporaria/image-A8918.html

http://www.arkive.org/robin/erithacus-rubecula/image-A9289.html

Eggs or very young animals seem generally to suffer most because they are competing with established organisms

Inheritance and variability

Darwin’s big ideas and ways of working: Unit 1

Pollination - bees transfer pollen and pollen carries the potential for variability in plants

Darwin grew54 varietiesof theCabbagefamily in hiskitchengarden

Inheritance and variability

Darwin’s big ideas and ways of working: Unit 1

Making Connections

Bumble bee

Field Mouse Cats

What is the connection between these organisms?

Red clover

Darwin’s big ideas and ways of working: Unit 1

Darwin made collectionsand noticed thevariability amongst theindividuals he collected

Inheritance and variability

Darwin’s big ideas and ways of working: Unit 1

Life CyclesSeed to seed

Some don’t survive even in a pod

Darwin’s big ideas and ways of working: Unit 1

Divergence of Character

List 5 ways in which dogs show divergence of character.

Darwin’s big ideas and ways of working: Unit 1

Creating Models

Darwin’s big ideas and ways of working: Unit 1

Extinction of less-improved forms

• ‘the same genera and species [of fossil plants] are found in the most remote regions where the plants now in existence are entirely different.’

(Darwin’s notebook on the transmutation of species)

• Endangered species appear on the Red List e.g. Wild horse

http://www.arkive.org/przewalskis-horse/equus-ferus-przewalskii/description.html

Darwin’s big ideas and ways of working: Unit 1

Extinction of wildlife occurs today because of:

• Habitat degradation – clearing for housing/roads/mining

• Human activities including hunting• Competition with domestic livestock/crops• Global warming• Flooding• Pollution – air, water, soil

Darwin’s big ideas and ways of working: Unit 1

Darwin’s big ideas and ways of working: Unit 1