Evolution of Sex and the DNA repair hypothesis

QUESTION: Evolution of Sex and the DNA repair hypothesis


DNA can be damaged in at least two ways. First, ionizing radiation or mutagenic chemicals can alter the genetic code. Second, mutations can occur via errors during the replication process. Most mutations are deleterious. In asexual organisms, any mutation that occurs in one generation will be passed on to the subsequent generation. Consider photocopying a document, then photocopying the photocopy, then photocopying the photocopy of the photocopy and so on. Clearly, the quality of the document deteriorates the more copies that are produced. Likewise, asexual organisms -- as they continue to accumulate mutations -- face the prospect of eventually becoming both unable to reproduce and unviable -- neither of which is at all helpful to evolution.

But sexual reproduction allows most plants and animals to create offspring with good copies of two genes via crossover and would thus help eliminate this quality depletion since mutations -- although they might still be passed on from one generation to the next -- would not necessarily be expressed in the next generation, for a mutation must appear in the genes of both parents before it can be expressed in the offspring.

Evolution of Sex and the DNA repair hypothesis - A Conclusion
One must not overlook an important fact in this theory. The theory attempts to explain why sex exists now, but does not address the origin of sex. It is one thing to develop a theory or hypothesis to explain something that already exists, but it is entirely another to develop a theory to explain how that specific phenomenon came into being.

Evolution of Sex - Learn More!

WHAT DO YOU THINK? - We have all sinned and deserve God's judgment. God, the Father, sent His only Son to satisfy that judgment for those who believe in Him. Jesus, the creator and eternal Son of God, who lived a sinless life, loves us so much that He died for our sins, taking the punishment that we deserve, was buried, and rose from the dead according to the Bible. If you truly believe and trust this in your heart, receiving Jesus alone as your Savior, declaring, "Jesus is Lord," you will be saved from judgment and spend eternity with God in heaven.

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