Evolution And Classification
Chapter Name : Heredity And Evolution |
Sub Topic Code : 103_10_09_05_01 |
Topic Name : Evolution And Classification |
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Sub Topic Name : Tracing Evolutionary Relationships |
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Introduction
Common ancestry can be predicted by looking at the similar features in different kinds of organisms.
Pre-Requisites:
Evolution and classification.
Activity:
Go to the biology lab/museum and observe the skeleton of the hand of human, lizard, bird and frog. Observe homologous organs.
Real Life Question:
Both bats and birds have wings, but squirrels and lizards don’t, so are bats and birds more closely related to each other than to squirrels and lizards?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Homologous characteristics Analogous characteristics | Organs or organ systems or features that have same structure but are used for different functions. Organs/features that have different structure but are used for same function. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Skeleton of bats and bird’s wing, | Observe analogous organs |
Places to visit :
Biology lab, museum
Practical examples around us
| Examples | Explainations |
|---|---|
| Arms of humans and lizards are used for different functions of eating and climbing walls respectively but have similar structure that signifies common ancestry. |
What you learn in Theory:
We learnt about homologous and analogous characteristics and how they relate to common ancestry.
What you learn in Practice:
We learn that birds and lizards might have had a common ancestor.