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Lesson 7: Comparing skeletons part 2
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Slide 1:
Tekstslide
Biologie
Middelbare school
vwo
Leerjaar 1
In deze les zitten
16 slides
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interactieve quizzen
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1 video
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Lesduur is:
45 min
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Get ready:
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Slide 1 - Tekstslide
Today:
Comparing skeletons part 2
-Evironment & Time
Worksheet comparing homologous structures
Slide 2 - Tekstslide
3. Environment
Water animals:
-Body shape in water
-Streamlined body
- minimize resistance from water
-Short and wide limbs
Slide 3 - Tekstslide
4. Time
-Skeletons change over time
-how bones are shaped can tell us something about the past
Vestigial organs:
Organs that an animal has but doesn't use
Slide 4 - Tekstslide
Example: Tail bone
Example:
Pelvis/Femur in whale
Vestigial organ with no function:
Slide 5 - Tekstslide
Evolution of whales
Slide 6 - Tekstslide
Leg bones in snakes -> Tickle females during mating
Vestigial organ with new function
Slide 7 - Tekstslide
Slide 8 - Video
Why are there not so many early fossils?
A
Early forms of life were soft bodied organisms
B
No animals were living a long time ago
C
Bones of those animals were never found
D
What are fossils again?
Slide 9 - Quizvraag
Which one is not an example of how fossils form?
A
When parts of organisms have not been decayed
B
Parts of organisms are slowly replaced by minerals during the decay process
C
Preserved traces of animals such as footprints
D
Animal bones are non-living and always remain in the earth surface
Slide 10 - Quizvraag
When is a species extinct?
A
When a group of animals of that species dies
B
When all animals of that species died
Slide 11 - Quizvraag
Discussion of Worksheet
Question 1:
Write at least two sentences describing what you already know about homologous structures?
Slide 12 - Tekstslide
The bones of the hand
The bones of the arm
Question 2
Slide 13 - Tekstslide
The next lesson:
-Owl ball dissection
Slide 14 - Tekstslide
Work further on the worksheet
-comparing homologous structures
-Question 3 to 9
Slide 15 - Tekstslide
HW for next lesson
-Finish the worksheet 'comparing homologous structures'
-Prepare for the owl dissection lab
Slide 16 - Tekstslide
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