Tuesday, March 23, 2010
Pass it on, or fail in life?
One of the primary reasons why an organism invests so much of their time and energy in reproducing is in order to pass on the genes to the next generations. And example experiment in explained in page 152-153 of Coyne's book. However, the question "If males with thiry-inch tails won more females, why haven't widowbirds evolved tails that long in the first place?" One of the answers to this question is longetivity. By investing energy in more survival, one many have find more partners. However, birds, such as peacocks, have many beings that go unmated to their deathbeds. Then comes the quesiton, why didn't the force of natural selection promote the elimination of organisms with such features? If organisms, such as peacocks, went unmated, shouldn't evolution have eliminated "unmating" genes? Why do such beings exist today?