We may suddenly suffer anemia, or skin diseases, because a lemur passed a defective gene to its descendants, who fortunately had other genes that compensated the defect and, eventually, it was passed to us, and we lived harmoniously for a time with the faulty plus the compensating gene.
De pronto podemos ser anémicos o sufrir enfermedades de la piel porque un lémur le pasó un gen defectuoso a sus descendientes, que por suerte tenían otros genes que compensaron el defecto del gen estropeado.