Evolutionary trade-off keeps deleterious genes in human populations

Deleterious genes for a number of life-threatening diseases which palpably affect human fitness appear to persist in the gene pool at perplexingly high frequencies when you would think they would be eradicated over time by purifying natural selection. Now a group of scientists headed by Tobias Lenz of Harvard Med School and the Max Planck […]

from The Evolution and Medicine Review http://ift.tt/2cFfXdG