On a positive note, research on male infertility may lead eventually to a genetic cure. Over millions of years, these mutations have led to the development of different species, and to evolutionary changes within species. Mutations that lead to species evolvement and evolutionary change occur almost exclusively in men. The reason for this is that perhaps 100 to 200 million sperm are produced every day in the testes of the average fertile man. A woman has all the eggs she will ever have at birth.
Mutations occur only when cells divide and produce inaccurate copies of genes.
This is the reason that modern geneticists are discovering that mutations and evolutionary changes occur strictly via the male. It is projected that by the year 2005, researchers will have mapped the entire human genetic sequence. Every day, new genes are identified that cause various illnesses. It is estimated that 100,000 genes are necessary to direct the construction of a normal human being. Research indicates that probably 60 percent of human genetic structure is not much different than that of the earthworm.