Apologetics · Creation — natural selection can only improve what already reproduces
Here is a question that almost never comes up in a biology classroom, and it is not a trick.
Where did sex come from?
Not the behavior. The system. Two categories of organism, each producing a different kind of cell, each carrying half a genome, engineered to find one another, recognize one another, fuse, and restart a complete organism from the fused result. Where did that arrangement come from, and how did it get past the enormous penalty it carries?
This is not a question invented by apologists to embarrass anyone. Evolutionary biologists have been arguing about it among themselves for over fifty years, and more than one of them has called it the single hardest problem in the field. That is a fair summary of the state of play, and it is worth understanding exactly why the problem is hard.
The Penalty Nobody Volunteers For
Start with the arithmetic, because the arithmetic is brutal and it is not in dispute.
An organism that reproduces asexually makes copies of itself. Every individual in the population is a producer. The line doubles.
An organism that reproduces sexually splits the population into two kinds, and in the standard case only one of them bears offspring. Every generation, that lineage pays roughly a fifty percent tax on its own reproductive output compared to the asexual line beside it. It also has to spend resources locating a mate, competing for one, and surviving the exposure that courtship involves. And it passes on only half its own genome instead of all of it.
Now put those two lineages in the same field and run natural selection. Selection is a numbers process. The line that produces twice as many offspring per generation should bury the other one in a few dozen generations.
And yet sexual reproduction is not a curiosity at the margins. It is the dominant strategy across nearly the whole of complex life. Something that should have been eliminated immediately, on the theory’s own terms, instead took over.
Be Fair About the Proposed Answers
Now, evolutionary biology has not been silent about this, and any Christian who pretends otherwise is arguing dishonestly. There are serious proposals, backed by real work.
One is that recombination lets a population purge harmful mutations more efficiently, so an asexual line slowly accumulates damage that a sexual line can shed. Another is that shuffling genes lets beneficial mutations from different individuals be combined into one descendant, which asexual lines cannot do. A third — often called the arms-race hypothesis — holds that parasites adapt fast to any fixed genetic profile, so constantly reshuffling the combination keeps hosts a step ahead.
These are not throwaway ideas. There is laboratory and field evidence pointing at each of them, and in certain organisms and certain conditions the advantage of recombination is measurable.
Grant all of it. Then notice what has actually been explained.
Maintenance Is Not Origin
Every one of those proposals is an argument about why sex, once it exists and is running in a population, might be worth the cost.
None of them is an argument about how it started.
That distinction is the whole ballgame, and it gets blurred constantly. A theory of why an established system persists is not a theory of how an absent system arose. You can explain why a company with a factory outcompetes a company without one, and you have said nothing whatsoever about how the first factory was built.
And the origin question is far harder, because none of the proposed advantages can do any work until the entire system is already functioning. Recombination cannot purge mutations before there is recombination. Parasite evasion cannot favor gene shuffling before gene shuffling exists. Every advantage on the list is a benefit of the finished machine, available only on the far side of the very gap that needs crossing.
The Matched Set
And what has to arrive to cross it is not one innovation. It is a set of them, and they are useless apart.
You need meiosis: a specialized cell division that halves the chromosome number with precision, pairing chromosomes correctly and separating them without error. You need gametes — cells built for fusion rather than for ordinary survival, and in most cases two very different kinds of them. You need a recognition system so that the right two cells find each other and the wrong combinations are refused. You need fusion machinery that merges two cells and their genomes without destroying either. And you need a developmental program that can take the fused cell and build an entire organism from it.
Now ask the selection question honestly. What does half of that do?
Meiosis without fusion produces cells with half a genome and no way to complete one. That is not an improvement; that is a dead end with a clock on it. Fusion without meiosis doubles the chromosome count every generation until the cell cannot function. Gametes without recognition drift past each other. Recognition without fusion machinery is a handshake with nothing on the other side.
Selection cannot preserve a component for a function it does not yet perform. It has no capacity to keep half a mechanism in reserve because the other half is coming. It works on what reproduces now, and each piece of this system, standing alone, reproduces worse than the unmodified organism it came from.
A Factory You Cannot Retool
There is a practical picture that makes the point better than the technical language does.
You can improve a running production line almost indefinitely. Better tooling, tighter tolerances, faster throughput — every change gets tested against output, kept if it helps, discarded if it hurts. That is how incremental improvement works, and it works well. Nobody disputes that populations change over time and that selection shapes them. Nobody disputes that finches’ beaks vary or that bacteria develop resistance.
But that entire process presupposes a line that is already running.
Sexual reproduction is not a refinement to the line. It is a second, completely different line, requiring different machinery and a different input, and it does not produce a single unit until it is complete. You cannot build it by improving the first one, because during construction it makes nothing, and a process that rewards output has nothing to reward.
Darwinism is a superb account of the tweaks. It has never been a good account of the leaps, and this is one of the largest leaps in the history of life.
What Genesis Says, and Says Early
The biblical text does not hedge on this. It puts complementary reproduction at the foundation of the created order and repeats it like a refrain.
And God said, Let the earth bring forth grass, the herb yielding seed, and the fruit tree yielding fruit after his kind, whose seed is in itself, upon the earth: and it was so. (Genesis 1:11, KJV)
Notice the phrase whose seed is in itself. The capacity to reproduce is not an afterthought added later. It is built into the thing from the first day it exists, as part of what it is.
And of humanity, stated as a single deliberate act:
So God created man in his own image, in the image of God created he him; male and female created he them. (Genesis 1:27, KJV)
Male and female, together, in one clause, as one creative work. Not one and then eventually the other. A matched pair, produced by an intention.
And he is before all things, and by him all things consist. (Colossians 1:17, KJV)
Consist in the older English means hold together — the whole arrangement is sustained by Him moment to moment, not merely started by Him once.
Where Believers Differ, and Where They Do Not
A necessary word here, because this argument gets dragged into a fight it does not belong in.
Christians disagree about the age of the earth. Young-earth believers read Genesis 1 as six ordinary days a few thousand years ago and argue the case with real scholarship. Old-earth believers read the days differently and argue their case with real scholarship too. Both groups hold that God created deliberately, that Adam was a real man, that the Fall was a real event, and that death entered through sin.
The origin-of-sex problem is not evidence for either side of that in-house question. It is upstream of it. It is a question about mechanism, not chronology — and it presses equally hard on any account that asks an unguided process to assemble a system that yields nothing until it is finished.
Keep the arguments separate. A Christian who conflates them ends up defending two claims at once and persuading nobody of either.
What This Does and Does Not Prove
Be careful here too, because overreach is how apologetics loses its credibility.
This does not prove God. An unsolved problem is an unsolved problem, and science has solved hard ones before. An honest person should hold the argument at the strength it actually has.
What it does establish is narrower and more useful. The confident tone is not earned. When someone says the origin of life’s complexity is essentially settled and only details remain, that person is not reporting the literature; he is reporting a mood. The literature contains a fifty-year argument about one of the most basic features of living things, and the argument is not close to resolved.
That should be enough to make a thoughtful skeptic slow down. And slowing down is all any honest apologetic can ask for, because nobody was ever argued into the kingdom.
The One Who Gives Life
Step back from the machinery for a moment and see what we are actually discussing.
The means by which nearly every living thing on this planet comes into being requires two halves that are useless alone, built to specifications that only make sense together, arriving at the same moment in history or not arriving at all.
A believer looks at that and is not surprised. Complementarity is written through the whole creation, and it is written through the gospel too — because the deepest version of the same pattern is a God who possesses life and a people who have none, and a cross where the two were joined.
In him was life; and the life was the light of men. (John 1:4, KJV)
You did not manufacture your biological life, and you cannot manufacture your spiritual one. Both are given.
The God who designed the means of life is offering you the life itself. Not improved. Not optimized. New — and from Him.
Teaching the Word. Watching the Times.
— SmithForChrist