Classification - Whales
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Module B3 Life on Earth
IB3.2 Follow the evidence
B3 Life on Earth
•
Whales are mammals.
•
All mammals share some features.
B3 Life on Earth
•
Whales belong to a group of mammals called the Cetacea.
•
Cetacea have two features that other mammals don’t have.
B3 Life on Earth
Cetacean group Baleen plates?
Teeth?
Echo-location?
Baleen
Yes
No
No
Sperm
No
Teeth in lower jaw only
Yes
Other toothed
No
Many teeth
Yes
Beaked
No
Few teeth
Yes
•
Cetaceans are split into four groups.
•
Click if you want to know more about baleen plates and echo-location.
B3 Life on Earth
•
Which of these ways of classifying whales is the most sensible?
•
Use the evidence in the last slide to help you.
B3 Life on Earth
•
From the evidence so far, baleen whales are more different.
•
There are 11 species of baleen whale.
•
They include blue whales and sperm whales.
•
Click if you want to know more about baleen whales.
B3 Life on Earth
•
But in the 1990s new evidence was found.
•
Scientists looked at DNA from 16 species of cetaceans.
•
The DNA showed that: - Sperm whales were more closely related to baleen whales than other groups. - Beaked whales are only distantly related to any of the other groups.
•
Look back at the your choice for classifying whales. Which way of classifying seems best now? Do you need to change your mind?
Q5, Q6
B3 Life on Earth
Discuss with a colleague • •
What is this lesson about? Suggest a suitable lesson objective(s) and outcomes for this lesson.
B3 Life on Earth
•
Changing your ideas doesn’t mean that you were wrong the first time. You just didn’t have enough information.
•
It also doesn’t mean that the new ideas are definitely right. Any conclusion is only as good as the evidence behind it.
B3 Life on Earth
•
You can get up to date information about whale classification here.
•
There’s more background information on whales here.
IB3.2 Follow the evidence
B3 Life on Earth
•
Whales are mammals.
•
All mammals share some features.
B3 Life on Earth
•
Whales belong to a group of mammals called the Cetacea.
•
Cetacea have two features that other mammals don’t have.
B3 Life on Earth
Cetacean group Baleen plates?
Teeth?
Echo-location?
Baleen
Yes
No
No
Sperm
No
Teeth in lower jaw only
Yes
Other toothed
No
Many teeth
Yes
Beaked
No
Few teeth
Yes
•
Cetaceans are split into four groups.
•
Click if you want to know more about baleen plates and echo-location.
B3 Life on Earth
•
Which of these ways of classifying whales is the most sensible?
•
Use the evidence in the last slide to help you.
B3 Life on Earth
•
From the evidence so far, baleen whales are more different.
•
There are 11 species of baleen whale.
•
They include blue whales and sperm whales.
•
Click if you want to know more about baleen whales.
B3 Life on Earth
•
But in the 1990s new evidence was found.
•
Scientists looked at DNA from 16 species of cetaceans.
•
The DNA showed that: - Sperm whales were more closely related to baleen whales than other groups. - Beaked whales are only distantly related to any of the other groups.
•
Look back at the your choice for classifying whales. Which way of classifying seems best now? Do you need to change your mind?
Q5, Q6
B3 Life on Earth
Discuss with a colleague • •
What is this lesson about? Suggest a suitable lesson objective(s) and outcomes for this lesson.
B3 Life on Earth
•
Changing your ideas doesn’t mean that you were wrong the first time. You just didn’t have enough information.
•
It also doesn’t mean that the new ideas are definitely right. Any conclusion is only as good as the evidence behind it.
B3 Life on Earth
•
You can get up to date information about whale classification here.
•
There’s more background information on whales here.
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