7.1 How it all began

• Biologie
• biology
• Middelbare school
• vwo
• Leerjaar 3

00:55

what are the two basic ideas of Darwin's evolution?

Put the events of Darwins life in the correct order. You can use your book!

Trip with the HMS beagle

Noticed diverstity

Visited Galapagos

Concluded species change

Darwin arrived back in England

Published 'the origin of species'

What do you need for Natural Selection

1. To be the biggest
2. To be unique
3. Being able to pass on genes
4. To adapt when you're still alive

natural selection 

--> every individual is unique (no clones)

--> differences in traits  are inheritable 

(Heredity) 

---> 1.  differences in inheritable traits 

i.e. there are green and brown beetles 

What will happen to the beetle population, when a bird comes by that only eats green beetles?

1. There will be more brown beetles
2. There will be more green beetles
3. The beetle population will stay the same
4. The beetle population will go extinct

green beetles tend to get eaten by birds and 

survive to reproduce less often than brown beetles

and surviving brown beetles have brown baby

beetles 

the more advantageous brown colouration which allows the brown beetle to have more offspring becomes more common in the beetle population. 

If this process continues, eventually, all individuals in the population will be brown 

--> Differential reproduction

If we know that natural selection = the process whereby organisms better adapted to their environment tend to survive and produce more offspring.

Then what do you think Artificial selection is?

fernandina

-> small fruit

santiago/san salvador

--> small seed

santa cruz

--> worms

pinta

--> large fruit

fernandina

-> small fruit

santiago/san salvador

--> small seed

santa cruz

--> worms

pinta

--> large fruit

Which finch belongs to which island?

fernandina

-> small fruit

santiago/san salvador

--> small seed

santa cruz

--> worms

pinta

--> large fruit

homework

Read Paragraph 7.1 and make the questions: 3, 4, 5, 6, 7