Microevolution is a small-scale change that affects a few genes within a population over a short period of time; bird beak size, moth wing color, etc. Macroevolution is a large-scale change that occurs over a longer period of time and can result in the formation of new species and groups; fish to amphibian transition.
While we have good reason and evidence for the former the latter is lacking.
Does natural selection guide evolution?This is
how it happens, but nothing there means guide as in "leads or directs the way", "steadying or directing the motion of something", "to direct, supervise, or influence, usually to a particular end". So, no natural selection doesn't guide evolution.
Gradualistic evolution
I admit that Gradualistic evolution does sound plausible; I used to believe it was true, as the reasons for that conclusion were sound: Given enough time, random mutations coupled with random environmental stresses can produce new sub-species that was better adapted to the environment. And this process could eventually bring forth all the diversity of life. And there was the fossil record to prove it
Problem 1: lack of fossils
The few supposed examples of gradual evolution were featured in the journals and textbooks, but paleontologists had long been mum about their "dirty little trade secret:" most species appear suddenly in the fossil record and show no appreciable change for millions of years until their extinction.
Eldredge and Gould (1972) pointed out, paleontologists
were raised in a tradition inherited from Darwin known
as phyletic gradualism, which sought out the gradual
transitions between species in the fossil record. They
viewed species as part of a continuum of gradual
change in anatomical characteristics through time.
Even their detractors concede that Eldredge and Gould
were the first to point out that modern speciation
theory would not predict gradual transitions over
millions of years, but instead the sudden appearance of
new species in the fossil record punctuated by long
periods of species stability, or equilibrium.
Eldredge
and Gould not only showed that paleontologists had
been out-of-step with biologists for decades, but also
that they had unconsciously trying to force the fossil record into the gradualistic mode. The few supposed
examples of gradual evolution were featured in the
journals and textbooks, but paleontologists had long
been mum about their "dirty little trade secret:" most
species appear suddenly in the fossil record and show
no appreciable change for millions of years until their
extinction.
Many of the gradual evolution examples
were restudied in critical detail, and turned out to be
ambiguous, or actually demonstrated punctuated
equilibria better than gradualism. Most
studies fell short because they focused on a single
lineage (neglecting faunal variation) from a single
section (neglecting geographic variation), often
showing change in only one characteristic (neglecting
morphological variation), which had not been analyzed
by rigorous statistical methods. Other cases failed
because they were on the wrong time scale to be
relevant to the debate, or too poorly dated to know
anything about change through time.
For example, one of the main proponents of
gradualism, Philip Gingerich (1976, 1980, 1987),
showed just two or three examples of supposed gradual
evolution in early Eocene (about 50-55 million years
old) mammals from the Bighorn Basin of northwestern
Wyoming. But a detailed examination of the entire
mammal fauna (monographed by Bown, 1979, and
Gingerich, 1989) shows that most of the rest of the
species do not change gradually through time.
As paleontologists
had known for over a century, most species are stable
for millions of years, and change so rapidly that we
rarely witness it in the fossil record. Of the hundreds
of studies that have been reviewed elsewhere (Gould
and Eldredge, 1977, 1986; Gould, 1992), a few stand
out (Stanley, 1992). Cheetham (1986) and Stanley and
Yang (1987) examined allthe available lineages of their
respective groups (bryozoans and bivalves) through
long intervals of time, using multivariate analysis of
multiple character states. Both concluded that most of
their species were static through millions of years, with
rare but rapid episodes of speciation.
Williamson (1981,
1985) examined the details of evolution of molluscs in
Lake Turkana, Kenya, and showed that there were
multiple examples of rapid speciation and prolonged
stasis, but no gradualism. Barnosky (1987) reviewed a
great number of different lineages of mammals, from
mammoths to shrews and rodents, that lived during the
last two million years of the Ice Ages. He found a few
examples of gradualism, but many more which showed stasis and punctuation
With one exception (gradual dwarfing
in the oreodont Miniochoerus), we found that all of the
Badlands mammals were static through millions of
years, or speciated abruptly (if they changed at all).
The discovery of stasis in most species for millions of
years was an fact that biologists did not expect (as
even Mayr, 1992, concedes). At first, they dismissed it
as genetic homeostasis or stabilizing selection (Charles worth et al., 1983; Levinton, 1983; Lande, 1985). But
such models are only appropriate on scales of a few
generations, or at most a few thousand years. No
environment is so constant that stabilizing selection
can act for millions of years.
Evidence from paleosols and land
floras (Retallack, 1992) document a striking cooling and
drying event across this boundary, with a woodland
vegetation replaced by a wooded grassland, mean
annual temperature declined almost 13 degrees C, and
the annual range of temperature increased
dramatically from 5 degrees C to about 25 degrees C.
There was an abrupt transition from
moist floodplains to semi-arid landscapes with
abundant wind-blown volcaniclastic dust. Most of these
events took place over a few thousand years. This is
certainly one of the most severe climactic events since
the extinction of the dinosaurs. In spite of all these changes, however, only one
lineage of fossil mammal underwent a gradual change.
All of the rest either remained unchanged through the
interval, or went extinct, with new species replacing
them.
None showed the panselectionist prediction of
gradually evolving to track their changing environment.
If species are static through millions of years in spite
of environmental changes, then there must be some
sort of homeostatic mechanism that preserves this
stability beyond what traditional reductionist
Neo-Darwinism once postulated.
Instead of the "rolling ball" metaphor so favored by
evolutionary biologists, perhaps species are more like
a polyhedron, which can roll rapidly over from face to
face, but resists change when it is sitting on one of its
stable faces (Gould, 1980b). Change only occurs when
the threshold necessary to tip it over has been
exceeded, and then the polyhedron will resist further
change until that threshold is once again reached.
Between stable states (the faces), however, the
transitions are very rapid.
So multiple independent scientific sources [the paper cites 40 different experts in the field] concluded that most of their species were static through millions of years, with rare but rapid episodes of speciation.
Pushback: it's a 30 yeard old paper.
Reply: True, but science and facts don't have an expiration date. If you have something that controverts what is cited in the paper please post it. Just saying, "It's an old paper" doesn't mean it's wrong.
The Engineering problem Stephen J Gould [one of the two scientists behind punctuated evolution] said in his book "The Structure of Evolutionary Theory":
I recognize that we know no mechanism for the origin of organismal features other than conventional natural selection at the organismic level [pg 710]
Here's a 20-min vid on how
punctuated equilibrium doesn't solve the problemLet's illustrate one of the difficulties with the fish to amphibian transition. There had to be changes from:
1) obtaining oxygen from water to directly from the air,
2) change from permeable scales to impermeable skin,
3) ventral, anal, and tail fins would have to go from steering to a) weight-bearing and b) to providing locomotion,
4) a two chambered, one loop heart system would have to transform into a three chambered, two loop heart.
And all of these changes had to happen 1) in concert, 2) on a molecular level and 3) while that species remained the fittest for its environment. The genetic code had to change in multiple proteins throughout multiple systems within the fish, all at basically the same time.
For example the
Cambrian explosion the unparalleled emergence of organisms between 541 million and approximately 530 million years ago at the beginning of the Cambrian Period. The event was characterized by the appearance of many of the major phyla (between 20 and 35) that make up modern animal life.
As I said gradualism seemed plausible if there were 100's of millions of years for a system of hit or miss chance, but there is not; take that element away, as Punctuated Equilibrium and the Cambrian explosion shows, then design [a purposeful, intentional, guided process with a goal in mind] is the much more likely candidate than a purposeless, unintentional unguided process without a goal.
The mathematical problemAnd it gets worse for the evolutionist. There are dozens of DNA based micromachines in our bodies like the
ATP Synthase which is a dual pump motor. The ATP Synthase has dozens of different parts; each is a protein which is formed from long strings of amino acids – 300 to 2,000 base pairs – which must be in a particular order, so they will fold correctly to perform a certain function.
But are there enough chances for evolution to occur since the universe began for evolution to work?
If every particle in the observable universe [1 × 10 to the 90th power] was a coin that flipped every Planck second [5.4 × 10 to the 44th power] since the beginning of the universe [4.32 × 10 to the 17th power - in seconds] there would be a max of ~ 1.07x10^133 events since the beginning of the universe. An average sized protein of 150 amino acids would take 7.2x10^195 to form via an unguided, purposeless, goalless process. That's more the amount of events in the entire history of the universe.
Note: ~1.07x10^133 takes into account the entire observable universe, but it's difficult to believe that particles outside the earth would affect evolution. Also, it's calculated from the beginning of the time [13.8 billion years] not the beginning of life [3.5 billion years], so the amount of total chances for evolution of life is much smaller. Somewhere around 2.5x10^61.
Also, there are vastly more ways of arranging nucleotide bases that result in non-functional sequences of DNA, and vastly more ways of arranging amino acids that result in non-functional amino-acid chains, than there are corresponding functional genes or proteins. One recent experimentally derived estimate places that ratio—the size of the haystack in relation to the needle—at 10^77 non-functional sequences for every functional gene or protein.
And we have many, many different kinds of these micromachines in our bodies. For instance, the ATP Synthase, the dual motor pump mentioned earlier, is part of the
Electron transport chain; four other DNA based, multiple part micromachines.
Sorry, but the math just doesn't hold up for a purposeless, unintentional unguided process without a goal for all those necessary genetic changes in multiple proteins in multiple organs that needed to for the fish to amphibian transition. Not to mention all necessary genetic changes in multiple proteins in multiple organs for the the 20 to 35 he major phyla in the Cambrian explosion.
An illustration:
Let's say there is a cabinet that the drawers slide in smoothly, is level, hinges work perfectly, the fit and finish is high quality, and was built within tight time constraints. You have 2 choices as to who is responsible for it: A) a person whow was trying to build a high quailty cabniet, who has skills and years of experience, and can show you the blueprints or B) a person who says he was just putting pieces together randomly without thinking, wasn't trying to build anything inparticular. Has zero skill and experience.
Evolutionists want me to believe that person B is more likely than person A, in fact they don't think person A should even be a canidate. But in actuality, to choose B over A, is to be ideologically driven, rather than to be driven by the facts and logic.
Conclusion: Evolution by a purposeless, unintentional unguided process without a goal does not hold up to scrutiny. Mathematically, the probability that is so low as to not be worthy of mentioning.
The design objection
Please don't say that design [purposeful, intentional guided process with a goal] is unscientific, since SETI looks for design [or artificiality - i.e. not generated by natural processes], an arson investigator can tell if a fire came about naturally or was started by a human, the police can determine if a death was natural or at the hands of a human, an archeologist can say whether it’s a just rock or an arrowhead, etc. An appeal to a designer is accepted in every field of inquiry, including biology - we can determine whether a virus, like Covid-19 was designed of was natural. An a priori non-design stance for evolution seems to be an a priori ideological conclusion, rather one that is driven by the facts
Pushback: This is a God of the gaps argument.
A God of the Gap argument assumes an act of God as the explanation for an unknown phenomenon. But I’m not citing an unknown phenomenon or a gap in our knowledge. I am using the inference to the best explanation and citing what we do know about DNA, the difference between fish and amphibians, in order to choose between design [purposeful, intentional guided process with a goal] over chance [a purposeless, unintentional unguided process without a goal].
Other common pushbacks:
You have confirmation bias
Confirmation bias "describes our underlying tendency to notice, focus on, and give greater credence to evidence that fits with our existing beliefs" But I wasn’t a Christian when I first encountered this, I became a Christian long after I rejected evolution.
You have a delusion
A delusion is a false belief or judgment about external reality; so I'll ask, 1) what is reality and 2) how do you know?
I have wrong, outdated info
Please state what specifically I got wrong?
Evolution has almost literal mountains of fossil evidence, evidence for evolution is overwhelming from multiple scientific disciples, there very good explanations for evolution, etc -
Where is this info that vindicates evolution? Please cite your sources
Even if you prove evolution to be false you have done nothing to prove your god exists
Proving God exists wasn’t the point of the post.
You aren't you dealing with the genetic evidence
I did - it's under Mathematical problems
We shouldn't have to straighten out every misunderstanding people have about science
If one making the claim that the info in the OP is wrong and that correct info is easily available they have the burden of proof.
Please read [this or that book on evolutionary theory]
If you think there is some pertinent point is some book, please provide that point.
Evolution is simply the idea that we inherit some traits from our parents
This is microevolution, not macroevolution