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BIOLOGY

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BIOLOGY
 

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BIOLOGYOnline version

INHERITANCE

by Creu Ahuir García
1

Genetic material in the form of DNA is found in the in cells or in the , in cells .

2

DNA
- DNA is a shaped like a
- It was discovered in
- It determines the of
- and are made of DN A

3

Inheritance is the .

4

CHROMOSOMES
Cromosomes are , just before .

- To be visible under a microscope they need to be .
- They were discovered in the century .
- Different species of organisms have a number of chromosomes .
- Humans have chromosomes , of each type .
- They are numbered acording they .
- They are shaped because just before each chromosome .

5

GENES
- Each is made up of hundreds of different . Each gene helps to a of the .
- Genes are passed from to , of the genes come from the and from the .
- The also influences characteristics .

6

The are called variation .

These variations are due to differences and differences :



7

Genetic differences are .

Environment : DNA isn't the only cause of variation , an environment also affects it .

8

Evolution is . It explains how .

There are main forms of evolution :
1 .
2 .
3 .
4 .
5 .

9

There are five main forms of evolution :

1 . Natural selection : are more likely to be and .

2 . Mutation : ( if , they may and through ) .

3 . Genetic drift : in smaller populations , can certain to become .

4 . Gene flow : organisms , introducing into a and increasing .

5 . Speciation : populations of the can become so that they can . This leads to .

10

THE IDEA OF EVOLUTION
The idea of ? ? evolution was first popularized by in . He proposed that species evolved through the process of . Since then , the theory of evolution has been supported by a .

Main points in his theory :
? Organisms of a species are not exactly alike , they exhibit .
? Many organisms will not until .
? Individuals with variations that best adapt them to their habitat have the .
? The best adapted organisms are to reproduce and have offspring .
? The offspring will some of the characteristics of their parents .
? If this continues there could be a in the species . Over time , it could change so much that it could .

11

If you find an organism and want to identify it , one way to do so is to use a . A key is a . The answer to each question leads you to the next until you arrive at the name of the organism .

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