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Key 
It is used to indentify an organism
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Variation 
Species: 
- A species are a group of organism that share the same features 
and that able to together produce a fertile offspring
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Variations are caused by ​Genes 
Eg: Genes can determine gender, eye colour etc 
 
 
Environmental - skintone, hair colour 
 
 
 
 

Inheritence 
Inheritence - Passing from parents to offsprings 
 
Genes determine the characteristics of the organism 
Genes are passed on to the offspring, which is why it looks like its 
parent
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Half of the genes from mother and father are passed on to the offspring
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Genes are found in chromosones inside the nuclei of a cell
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Sugar, a phosphate group and thymine, ademine, cytosine and guamine 
 
 
Watson and Cricked discovered the DNA Model, the model is called…
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NO 2 GAMETES ARE THE SAME 
 

Selective Breeding 
Known as ‘Aritificial Selection’ 
Choosing desired characteristics/Desired Characteristics Being Picked 
 
Domesticated Animals are known as breed and are bred by a 
professional breeder
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Hybrid are known as Purebred, which means animals of different breed 
Known as crossbreeds for plants and animals 
 
Crossbreeding/Hybridization:  
Process of crossing dissimilar individuals to bring together the best of 
both organisms
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Example:  
There were short and long necked giraffes in a forest, slowly, the short 
necked giraffes died because they couln’t eat the tree leaves, which 
then led to the long necked giraffes to reproduce, causing the offspring 
to inherit the long necked giraffes
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Natural Selection caused the population of 
resistant bacteria to increase

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