If all the species that use sexual reproduction evolved from the same root, how did the distinctive proteins on gametes differ in each species?
Biological fact: Eggs can recognize the proteins on sperms and they allow only the sperms of its own species to penetrate in. For example, a human egg wouldn’t let in a monkey sperm for fertilization. All species have special proteins on their sperms that are exclusive to them so that their sperms can be recognized by the eggs of the same species. Moreover, the eggs of many species attract the sperms of the same species by using secretion, sperms would have had trouble finding the eggs of its species if it wasn’t so.
Question: If all the species that use sexual reproduction evolved from the same root, how did these distinctive proteins differ in each species? The differentiation of the proteins of sperms must exactly coincide with the evolution of proteins on eggs in a way that recognizes the new sperm proteins, and this would be a mathematical miracle. The thing we are mentioning is similar to dropping our key accidentally and having it twisted, and finding our lock twisted as well in a way that matches perfectly with the new shape of our key when we go home. This coincidence must have happened for every sexually-reproducing species, and this means that miracles as many as the number of sexually-reproducing species must have taken place. Am I missing something in this way of thinking? How can you explain sexual reproduction with evolution? Thanks…
– Question by Doganay via the Ask a science question page.
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