在黑人中,首先发现了镰状细胞性贫血。对于这种镰状细胞性贫血的遗传基因,目前已有了新的认识。患这种贫血病的人,具有抗疟疾的能力。因此,这种疾病在非洲热带地区,肯定会有某些存在的价值。患有镰状细胞性贫血的病人,他们的体内所存在的这种疾病的遗传基因,是由他们的父母遗传的。如果一个孩体中仅遗传到一个遗传基因,他(她)就能抵御疟疾,但也不会患贫血。这样看来,从父母身上遗传到的不合理的基因,是不会影响他们抵抗疟 Among blacks, sickle cell anemia was first found. For this sickle cell anemia genetic, there is a new understanding. People with this anemia have the ability to fight malaria. Therefore, there is bound to be some value of this disease in tropical regions of Africa. In patients with sickle cell anemia, the genetic predisposition to the disease in their body is inherited by their parents. If only one gene is inherited in a child, he or she can resist malaria but not anemia. In this way, the unreasonable genes inherited from parents will not affect their resistance to malaria