Evolution And Classification
Chapter Name : Heredity And Evolution |
Sub Topic Code : 103_10_09_05_03 |
Topic Name : Evolution And Classification |
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Sub Topic Name : Evolution By Stages |
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Introduction
Complex but favorable organ changes are evolved bit-by-bit over many generations.
Pre-Requisites:
What are fossils? How are they formed and what do they tell us about life on earth millions of years ago?
Activity:
Observe the structure of the eye of octopus, an insect, birds and humans. Although all these organisms have eyes, their structures are different pointing to different evolutionary ancestor.
Real Life Question:
Almost all animals have eyes; does this mean all have the same common ancestor?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Evolution | Changes in inherited characters that lead to formation of new characters. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Variants of cabbage – cauliflower, kale, kohlrabi. Broccoli. | Evolution from same ancestor. |
Places to visit :
Museum, biology lab, vegetable garden.
Practical examples around us
| Examples | Explainations |
|---|---|
| Cabbage, kale, kohlrabi, cauliflower and broccoli all have the same ancestor. |
What you learn in Theory:
Evolution happens in stages.
What you learn in Practice:
We can evolve different variants of a species, like that of cabbage by introducing few changes in the DNA.