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In the world today there are people that don't have the ability to tolerate the sugar, lactose, in milk.
There are people with variation of able to drink milk which will allow them to drink milk or not to drink milk.
The trait can be passed down form generation so the people with lactose are not able to drink milk. And then that means there kids maybe depending on he Carrier from each parent.
The reproductive advantage of not being lactose intolerant is that it is another food source. Compared to someone that is lactose intolerant has a chance of getting the disease like E coli.
This survival help them drink raw milk without getting sick. This helped them survive because they can get more food source.
The trait is reproductive advantage because they cant get more food source.
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