It’s worth pointing out that evolution sometimes will just randomly evolve traits that don’t really help a creature survive more, it just doesn’t make it worse at surviving.
if you have it, life is hard. pre-modern-medicine you died young. however if you are just a carrier (you have to carry two recessive genes to have the disease, but if you only have one you’re a carrier. i think it’s recessive, i learned this 20 years ago) you have remarkable resistance to malaria.
It’s worth pointing out that evolution sometimes will just randomly evolve traits that don’t really help a creature survive more, it just doesn’t make it worse at surviving.
i want to point out sickle cell anemia.
if you have it, life is hard. pre-modern-medicine you died young. however if you are just a carrier (you have to carry two recessive genes to have the disease, but if you only have one you’re a carrier. i think it’s recessive, i learned this 20 years ago) you have remarkable resistance to malaria.
life is funny that way.