5.11 Selective breeding of animals

E.g --> The cow

• Desired characteristic - milk yield 
• 50ml - each time 
• However other cows produce 150ml of milk or 100 ml  
• The farmer will collect all the milk, but he chooses the milk that produces the most milk to become his breeding cows 
• This goes on as the generations come 
• They are selected for the desired characteristics 
• This will be developed as the selective breeding gets better 
• The characteristic wanted must be controlled by the gene