7.1 How it all began

odd one out 
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Slide 1: Tekstslide
BiologiebiologyMiddelbare schoolvwoLeerjaar 3

In deze les zitten 26 slides, met tekstslides en 4 videos.

time-iconLesduur is: 50 min

Onderdelen in deze les

odd one out 

Slide 1 - Tekstslide

what do they have in common? 

Slide 2 - Tekstslide

Slide 3 - Tekstslide

1

Slide 4 - Video

00:55
what are the two basic ideas of Darwin's evolution?

Slide 5 - Tekstslide

Slide 6 - Tekstslide

Inference 2

DIFFERENTIAL 
REPRODUCTION

Slide 7 - Tekstslide

natural selection 
--> every individual is unique
--> differences in traits  are inheritable 

---> 1.  variation in inheritable traits 

i.e. there are green and brown beetles 

Slide 8 - Tekstslide

---> differential reproduction 

i.e. 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 

Slide 9 - Tekstslide

--> final result 


i.e. 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 

Slide 10 - Tekstslide

Slide 11 - Video

Slide 12 - Tekstslide

fernandina
-> small fruit

santiago/san salvador
--> small seed

santa cruz
--> worms

pinta
--> large fruit





Slide 13 - Tekstslide

fernandina
-> small fruit

santiago/san salvador
--> small seed

santa cruz
--> worms

pinta
--> large fruit





Slide 14 - Tekstslide

Slide 15 - Tekstslide

Slide 16 - Tekstslide

Slide 17 - Tekstslide

different types of adaptations
structural:  
      changes of body parts 
      mimicry : a species resembles another species 
physiological: 
      changes in cell metabolism

--> what type of changes do you see in the next video? 

Slide 18 - Tekstslide

Slide 19 - Video

  • If you cut off a rat’s tail will its babies have no tail?  
  • If I straighten my hair every day is there a chance that my children will have straight hair? 


Slide 20 - Tekstslide

Darwin vs Lamarck
Darwin: natural selection of inherited traits
Lamarck: 
- use and disuse : individuals lose characteristics they do not require and develop the ones that are useful
- inheritance of acquired traits : individuals inherit the traits their ancestors acquired during their lifetimes 

Slide 21 - Tekstslide

Slide 22 - Tekstslide

How might Darwin have explained the ability of birds of prey to fly very fast?

  • birds of prey need to fly fast to catch prey
  • within the bird of prey species, some individuals can fly faster than others. These faster birds catch more food, do better and have more offspring. Such offspring, at least to some extent, inherit their parents ability.
  • Over the generations the birds evolve the ability to fly very fast 

Slide 23 - Tekstslide

How might Lamarck have explained the ability of birds of prey to fly very fast?
  • birds of prey need to fly fast to catch prey
  • over their life time, birds develop the appropriate large flight muscles and other key features to pass on, at least to some extent, to their offspring
  • over the generations the birds evolve the ability to fly very fast 

Slide 24 - Tekstslide

homework
Read section 7.1 
Do q. 1, 2, 3, 5, 6

Slide 25 - Tekstslide

Slide 26 - Video