Monthly Archives: September 2013

News

Convergence detected in the genetic structure of bats and dolphins

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We have to start this post with the definition of convergence in biology.

In evolutionary biology, convergent evolution is the process whereby organisms not closely related (not monophyletic), independently evolve similar traits as a result of having to adapt to similar environments or ecological niches.

It is the opposite of divergent evolution, where related species evolve different traits.

On a molecular level, this can happen due to random mutation unrelated to adaptive changes; see long branch attraction. In cultural evolution, convergent evolution is the development of similar cultural adaptations to similar environmental conditions by different peoples with different ancestral cultures. An example of convergent evolution is the similar nature of the flight/wings of insects, birds, pterosaurs, and bats.

All four serve the same function and are similar in structure, but each evolved independently.

Jonathan Wells explains the problem that convergence poses for naturalistic evolution:

Human designers reuse designs that work well. Life forms also reuse certain structures (the camera eye, for example, appears in humans and octopuses). How well does this evidence support Darwinian evolution? Does it support intelligent design more strongly?

Evolutionary biologists attribute similar biological structures to either common descent or convergence. Structures are said to result from convergence if they evolved independently from distinct lines of organisms. Darwinian explanations of convergence strain credulity because they must account for how trial-and-error tinkering (natural selection acting on random variations) could produce strikingly similar structures in widely different organisms and environments. It’s one thing for evolution to explain similarity by common descent—the same structure is then just carried along in different lineages. It’s another to explain it as the result of blind tinkering that happened to hit on the same structure multiple times. Design proponents attribute such similar structures to common design (just as an engineer may use the same parts in different machines). If human designers frequently reuse successful designs, the designer of nature can surely do the same.

I’m a software engineer, and we re-use components all the time for different programs that have no “common ancestor”. E.g. – I can develop my String function library and use it in my web application and my Eclipse IDE plug-in, and those two Java programs have nothing in common. So you find the same bits in two different programs because I am the developer of both programs. But the two programs don’t extend from a common program that was used for some other purpose – they have no “common ancestor” program.

Now with that in mind, take a look at this recent article from Science Daily, which Mysterious Micah sent me.

Excerpt:

The evolution of similar traits in different species, a process known as convergent evolution, is widespread not only at the physical level, but also at the genetic level, according to new research led by scientists at Queen Mary University of London and published in Nature this week.

The scientists investigated the genomic basis for echolocation, one of the most well-known examples of convergent evolution to examine the frequency of the process at a genomic level.

Echolocation is a complex physical trait that involves the production, reception and auditory processing of ultrasonic pulses for detecting unseen obstacles or tracking down prey, and has evolved separately in different groups of bats and cetaceans (including dolphins).

The scientists carried out one of the largest genome-wide surveys of its type to discover the extent to which convergent evolution of a physical feature involves the same genes.

They compared genomic sequences of 22 mammals, including the genomes of bats and dolphins, which independently evolved echolocation, and found genetic signatures consistent with convergence in nearly 200 different genomic regions concentrated in several ‘hearing genes’.

[…]Consistent with an involvement in echolocation, signs of convergence among bats and the bottlenose dolphin were seen in many genes previously implicated in hearing or deafness.

“We had expected to find identical changes in maybe a dozen or so genes but to see nearly 200 is incredible,” explains Dr Joe Parker, from Queen Mary’s School of Biological and Chemical Sciences and first author on the paper.

“We know natural selection is a potent driver of gene sequence evolution, but identifying so many examples where it produces nearly identical results in the genetic sequences of totally unrelated animals is astonishing.”

Nature is the most prestigious peer-reviewed science journal. This is solid material.

There is an earlier article from 2010 in New Scientist that talked about one of the previous genes that matched for hearing capability.

Excerpt:

Bats and dolphins trod an identical genetic path to evolve a vital component of the complex sonar systems they use to pursue and catch prey.

The finding is unusual, because although many creatures have independently evolved characteristics such as eyes, tusks or wings, they usually took diverse genetic routes to get there.

Analysis of a specific gene has now demonstrated that although bats live in air and dolphins in water, where sound travels five times faster, they independently evolved a near-identical gene that allows them to accept high-frequency sound in the ear – vital for sonar.

The gene makes prestin, a protein in hair cells of the cochlea, which is the organ in the inner ear where sonar signals are accepted and amplified. Prestin changes shape when exposed to high-frequency sound, and this in turn deforms the fine hair cells, setting off an electrical impulse to the brain. So the protein has the important jobs of detecting and selecting high-frequency sounds for amplification.

When researchers examined the molecular structure of the prestin gene from a range of animals, they found that the variants in echolocating bats and dolphins were virtually indistinguishable.

Indistinguishable genes in animals that don’t share a common ancestor? Maybe a better explanation for the evidence we have is – common designer.

Podcasts

Chris Sinkinson debates John Hick on religious pluralism and salvation

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Looks like Justin Brierley on the Unbelievable radio show found a pastor with a Ph.D in philosophy, and he can really whip some ass.

The players:

John Hick is a noted philosopher and theologian who is a proponent of a pluralist view of religion – that there is one light (God) but many lampshades (religious expressions).

Chris Sinkinson is a pastor and Bible tutor who has critiqued Hick’s work.  He says that pluralism empties Christianity of any content and in its own way disrespects other religions more than his own exclusivist stance.

The MP3 file is here.

Justin does a great job as moderator of this debate. He said what I was thinking of saying a number of times during the debate.

Anyway, here is my snarky summary. I creatively paraphrase some of the things that Hick says to make it more clear. And funny.

—-

Hick:
– had an experience looking at the buildings of other religions
– other religions have buildings, so all religions are equal
– I spent some time in the East, and met nice Eastern people
– since Eastern people are nice that means all religions are equal

Justin:
– isn’t Jesus’ claim to be the exclusive path to salvation offensive?

Sinkinson:
– all religions that are exclusive and have to deal with religious pluralism
– even John Hick writes polemically in favor of his own view
– even John Hick thinks that religions that are exclusive are false

Justin:
– what about the blind man and the elephant?
– the story seems to say that other people have a partial grasp?
– but the story-teller himself has the privileged view
– so isn’t the religious pluralist just as arrogant as exclusivists?

Hick:
– well, it’s not arrogant to claim to have the right answer
– Jesus never made the claim to be God incarnate
– Jesus never made the claim to be the exclusive path to God
– historians don’t think that John’s gospel is reliable because it is late
– the proclamation of exclusivity was added by evangelists much later

Sinkinson:
– the historians who doubt the high Christology are radical skeptics
– the mainstream of historical scholarship accepts a high Christology
– the EARLIEST history about Jesus has the highest Christology

Hick:
– the moderate scholars do think Jesus was divine but that he didn’t think he was divine
– the phrase “Son of God” was used to describe any remarkable person
– only later did the early church turn the generic term into “God the Son”

Sinkinson:
– there is reflection on Jesus’ identity and developments, but not invention
– Jesus and his followers were in trouble precisely for linking him to deity
– why else would Jesus get into trouble and get crucified?

Hick:
– the Romans crucified him because people were saying he was the Messiah
– but the Messiah was not identified as being divine, but political
– and that’s why the Romans crucified him

Justin:
– do you (Sinkinson) think that people in other religions can be saved?

Sinkinson:
– the traditional view is exclusivism
– the other world religions are logically contradictory with Christianity
– you have to respect their differences – they are not the same as Christianity
– exclusivists allow that people can be saved by responding to natural theology
– and there are also other cases where non-Christians are saved, like old testament saints and babies who die in infancy

Hick:
– but people’s religions are based on where they are born
– so it’s not fair for God to expect people to be saved in one religion only

Sinkinson:
– the plurality of religions grouped by location doesn’t make christianity false
– that would be the genetic fallacy – rejecting an idea because of its origin
– the real question to consider is whether it is true
– and even the objection assumes that God is a God of love, who should be fair
– but how do you know that God is loving? that is an exclusive view
– how can the “blob” ultimate of religious pluralism be “loving” and “fair”

Hick:
– the ultimate reality is loving or not loving depending on each person’s religion

Sinkinson:
– but some religions and theistic and some are atheistic
– how can those God exist and not exist?

Hick:
– God is beyond everyone’s understanding, except mine
– God is beyond all definitions, except mine
– God is beyond all human understanding, except mine
– i’m not contradicting myself, it’s a mystery! a mystery!
– as long as you don’t look to closely, they’re all the same!
– allow me to tell you about God, which no one can do but me

Justin:
– doesn’t your religious pluralism mean that Christianity is false?

Hick:
– well, Christianity can’t be true, because it disagrees with other religions
– Christianity can’t falsify other religions, that would be mean to them
– other religions are just as “profound” as Christianity – and that’s what matters – not whether a religion makes true claims
– some religions are older than Christianity, that means they can’t be disagreed with
– we can’t let Christianity be true, because then some people will feel bad
– if people feel bad, then they don’t like me and then I feel bad
– if there’s one thing I know about the unknowable ultimate reality, it’s that it wants me to be liked by lots of people

Sinkinson:
– your view seems to be agnosticism – that nothing can be known about the “ultimate real”
– if we can’t express in words what God is like, then why are you saying what God is like?

Hick:
– the indescribable ultimate is described (falsely, but interestingly) by various tradition

Sinkinson:
– does the “ultimate real” exist?

Hick:
– no

Justin:
– are all the exclusive religions wrong, and only you are right?

Hick:
– all propositions about God in all the religions are false
– the experience of being deluded and having feelings about your delusions is “valid” in all religions
– all religions are equally good ways to believe false things and to have feelings about your false beliefs
– only my propositions about God are true
– everyone who disagrees with me is wrong

Sinkinson:
– so all the propositions of all the religions are wrong
– but all the experiences and feelings are “right”

Hick:
– yes
– all propositions about God are humanly constructed, and so false
– except mine – mine are true!

Sinkinson:
– so everything distinctive about Christianity are literally false?

Hick:
– yes, Christian doctrines are all false
– because if they were true, other religions would be false, and they would feel bad
– and we can’t have that, because everyone has to like me
– only things that don’t offend people in other religions can be true

Sinkinson:
– so do we have to then treat all religions as non-propositional?

Hick:
– well just don’t ask people about the content of their beliefs
– just treat their religion as non-cognitive rituals, feelings and experiences
– don’t inquire too deeply into it, because all religions are all nonsense
– i’m very respectful and tolerant of different religions!

Sinkinson:
– but Muslims, for example, think their religion is making truth claims

Hick:
– but there can be tolerance as long as you treat religions as non-propositional nonsense

Sinkinson:
– um, I have a higher respect for religions than you do
– I actually consider that the claims of other religions could be true
– I think that other religions make truth claims and not nonsense claims

Hick:
– well they are all useful because they are all false
– I don’t emphasize beliefs, I emphasize living, experiences and feelings
– as long as everyone accepts my view and rejects their religion, we’ll all be tolerant

Justin:
– erm, isn’t that an exclusive claim?
– you’re trying to say that your view of what religion is is right, and everyone else is wrong

Hick:
– I’m not arrogant, I just think that all the religions of the worlds are false
– only my statements about religion are true – everyone else is wrong
– I’m tolerant, and Christians are arrogant

Justin:
– but you think Sinkinson’s view is wrong
– why should we accept your view and deny his view?

Hick:
– His view of salvation is false, and mine is true

Sinkinson:
– you use words with set meanings, but you mean completely different things
– when I say salvation, I mean deliverance from sins through Jesus

Hick:
– I get to decide what salvation means for everyone, you intolerant bigot

Sinkinson:
– but that word has a specific meaning that has held true in all of Christian history
– but what you mean by salvation is people having subjective delusions that are not true

Hick:
– I don’t like using the word salvation

Sinkinson:
– but you just used it!
– and you think that it is present in different world religions, but it isn’t

Hick:
– God is unknowable and indescribable
– God isn’t a wrathful God though
– and the Christian description of God is false
– Evangelical Christians are mean
– I had experiences with people of other faiths
– and these experiences taught me that religions that think that the universe is eternal are true
– as long as you reduce religion to behaviors and not truth, then religions are all good at producing behaviors
– if you just treat all religions as clothing fashion and food customs, they are all valid
– the main point of religion is for people to agree on cultural conventions and stick to them
– never mind the propositional statements of religions… who cares about truth? not me!
– but Christianity is definitely false

Sinkinson:
– the Judeo-Christian God is different – he reveals himself to humans
– he is distinct from the other religions
– he is personal, and is loving but also angry at sin

Hick:
– But God isn’t a person, and he isn’t a non-person
– I can’t say what he is – I’ll offend someone if I say anything at all!
– except Christians – I can offend them because they are arrogant bigots
– I’m also very spiritual – I meditate on my breathing

Sinkinson:
– you can’t assess a religion by the experiences that people have
– people who have weird experiences do all kinds of evil things
– so the real question has to be about truth – is the New Testament reliable?, etc.

News

How early are the doctrines of the Incarnation and the Trinity?

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Here’s a great post from Tough Questions Answered. They find evidence for the Incarnation and the Trinity in the writings of Ignatius, who was the third Bishop of Antioch from 70 AD to 107 AD.

Here’s the raw quote from Ignatius’ “Epistle to the Ephesians”:

But our Physician is the only true God, the Father and Begetter of the only-begotten Son.  We have also as a Physician the Lord our God, Jesus the Christ, the only-begotten Son and Word, before time began, but who afterwards became also man, of Mary the virgin. For “the Word was made flesh.”  Being incorporeal, He was in a body; being impassible, He was in a passible body; being immortal, He was in a mortal body; being life, He became subject to corruption, that He might free our souls from death and corruption, and heal them, and might restore them to health, when they were diseased with ungodliness and wicked lusts.

And TQA discusses the passage:

There are several aspects of this passage which demonstrate that Saint Ignatius held beliefs consistent with the Doctrines of the Trinity and the Dual Nature of Christ.  First, he refers to two separate Persons, God the Father and Jesus Christ, yet he calls both of them God.

[…]Second, Ignatius refers to Jesus Christ as begotten “before time began”.  This is almost word for word identical to the Nicene Creed, which says, “I believe in. . . one Lord, Jesus Christ, the Son of God, the only-begotten, begotten of the Father before all ages. . .”  Some today claim that the Early Church believed Christ’s being ”begotten” of the Father was in relation to His birth from Mary (specifically, this is an LDS claim).  However, Ignatius’ comment here demonstrates that the Early Church’s understanding of Christ’s nature as “only-begotten” was a relationship with the Father that was “before time began” and has nothing to do with His earthly incarnation.  It is interesting to note that the Greek word translated as “only-begotten” both here and in the New Testament is ”monogenes”.  Monogenes literally means “one of a kind,” and to the Church Fathers it connoted Christ being of the same nature as the Father. . . something that was entirely unique to Him.

In addition to calling Christ God and claiming Him to be the “only-begotten” of the Father “before time began”, Ignatius tells us that “afterwards” Christ “became man”.  Ignatius then goes on to point out some aspects that Christ’s becoming man added to His nature.  He says that although Christ was incorporeal, He was in a body; although He was impassible, He was in a passible body; although He was immortal, He was in a mortal body;  although He was life, He became subject to corruption.  These differing aspects of Christ’s nature, aspects that are polar opposites to one another, speak to Christ having two natures, one as God and one as man, and demonstrate that Saint Ignatius understood Christ in this manner.  As God, Christ was incorporeal, impassible, immortal, and life itself.   However, as man He was corporeal, passible, mortal, and subject to corruption.

Now I think you can pull the Incarnation and the Trinity right out the Bible, but it’s still nice to see such a prominent church father writing about it decades after the events.