Evolution 2008 is for teachers

Teachers, come to Minneapolis this summer! Not for the Republican convention, but for the other great big important meeting that will be taking place: Evolution 2008.

Teachers in particular get a really good deal: a special workshop is planned, specifically on the teaching of evolutionary biology in the schools. We’ve got some good speakers (and me) lined up, and the registration cost of a mere $20 not only gets you into the workshop, but into the regular meetings as well. Here are the details:

Evolution 101 Workshop for K-12 Educators
Friday, June 20, 2008
Bell Museum of Natural History
University of Minnesota
.625 CEUs

One $20 registration also gives K-12 teachers access to sessions and symposia by the sponsoring scientific organizations, as well as social events and keynote speakers for the full conference, June 20-24.

The EVOLUTION 101 workshop provides K-12 educators with information to effectively teach evolutionary biology in public and private school science classrooms. The workshop provides teachers the opportunity to interact with professional scientists who are eager to encourage evolutionary pedagogy. With one registration, K-12 teachers will also have access to presentations by the professional organizations, as well as keynote speakers for the full conference, June 20-24.

Registration: $20 non-refundable

A certificate of completion and .625 Continuing Education Units will be awarded for attendance at this workshop.

For more information about this workshop and to register on-line, please visit:
http://www.cce.umn.edu/conferences/evolution/evolution_101.html

The workshop is sponsored by the Society for the Study of Evolution (SSE), Minnesota Citizens for Science Education (MnCSE), and the Bell Museum of Natural History, with the generous financial support of the ADC Foundation.

The University of Minnesota is an equal opportunity educator and employer.
© 2008 Regents of the University of Minnesota. All rights reserved

An exercise for the readers

I and a diverse group of people got a question in email, one that we are supposed to answer in a single sentence. The question is,

What is evolution?

You know, Ernst Mayr wrote a whole book to answer that question on a simple level, and I’m supposed to have the hubris to answer that in one sentence? OK, knowing full well that it is grossly inadequate, here’s my short answer:

Evolution is a well-confirmed process of biological change that produces diversity and coherent functionality by a variety of natural mechanisms.

Go ahead, you people try to answer it in one sentence in the comments. It’s harder than it looks, especially since I feel the itch to expand each word into a lecture.

By the way, when I say this question was sent to a diverse group of people, I mean a diverse group of people. One of them was the author of this book, and another was from this site, and you can imagine what their answers were. (Sorry, they were sent out with some expectation of confidentiality, so I can’t tell you them. Maybe they’ll notice all the traffic to their websites and share it with us.)

The choanoflagellate genome and metazoan evolution

Blogging on Peer-Reviewed Research

What are the key innovations that led to the evolution of multicellularity, and what were their precursors in the single-celled microbial life that existed before the metazoa? We can hypothesize at least two distinct kinds of features that had to have preceded true multicellularity.

  • The obvious feature is that cells must stick together; specific adhesion molecules must be present that link cells together, that aren’t generically sticky and bind the organism to everything. So we need molecules that link cell to cell. Another feature of multicellular animals is that they secrete extracellular matrix, a feltwork of molecules outside the cells to which they can also adhere.

  • A feature that distinguishes true multicellular animals from colonial organisms is division of labor — cells within the organism specialize and follow different functional roles. This requires cell signaling, in which information beyond simple stickiness is communicated to cells, and signal transduction mechanisms which translate the signals into different patterns of gene activity.

These are features that evolved over 600 million years ago, and we need to use a comparative approach to figure out how they arose. One strategy is to pursue breadth, cast the net wide, and examine divergent forms, for instance by
comparing multicellular plants and animals. This approach leads to an understanding of universal properties, of how general programs of multicellular development work. Another is to go deep and examine closer relatives to find the step by step details of our specific lineage, and that’s exactly what is being done in a new analysis of the choanoflagellate genome.

[Read more…]

The genome is not a computer program

The author of All-Too-Common Dissent has found a bizarre creationist on the web; this fellow, Randy Stimpson, isn’t at all unusual, but he does represent well some common characteristics of creationists in general: arrogance, ignorance, and projection. He writes software, so he thinks we have to interpret the genome as a big program; he knows nothing about biology; and he thinks his expertise in an unrelated field means he knows better than biologists. And he freely admits it!

I am not a geneticist or a molecular biologist. In fact, I only know slightly more about DNA than the average college educated person. However, as a software developer I have a vague idea of how many bytes of code is needed to make complex software programs. And to think that something as complicated as a human being is encoded in only 3 billion base pairs of DNA is astounding.

Wow. I know nothing about engine repair, but if I strolled down to the local garage and tried to tell the mechanics that a car was just like a zebrafish, and you need to throw a few brine shrimp in the gas tank now and then, I don’t think I would be well-received. Creationists, however, feel no compunction about expressing comparable inanities.

[Read more…]

15 misconceptions about evolution

Take a look at this excellent list of evolution misconceptions. The entries are very brief, but mostly correct and very common: in particular, #12, “Natural selection involves organisms ‘trying’ to adapt” is one of the most common mistakes in creationist thinking — they completely miss one of the most important insights that Darwin had.

But I have to nitpick a little bit. #6, “The theory is flawed,” gives the wrong answer — it basically tries to argue that the theory of evolution is not flawed. Of course it is! If it were perfect and complete we’d be done with it, and it wouldn’t be a particularly active field of research. The “flaws” that creationists typically bring up aren’t flaws in the theory at all, but flaws in the creationists’ understanding of the science, but let’s be careful to avoid giving the impression of perfection.

#15 is also a pet peeve: “Evolution is a theory about the origin of life” is presented as false. It is not. I know many people like to recite the mantra that “abiogenesis is not evolution,” but it’s a cop-out. Evolution is about a plurality of natural mechanisms that generate diversity. It includes molecular biases towards certain solutions and chance events that set up potential change as well as selection that refines existing variation. Abiogenesis research proposes similar principles that led to early chemical evolution. Tossing that work into a special-case ghetto that exempts you from explaining it is cheating, and ignores the fact that life is chemistry. That creationists don’t understand that either is not a reason for us to avoid it.

#13, “Evolution means that life changed ‘by chance’,” also ducks the issue more than it should. As it says, natural selection is not random — but there’s more to evolution than natural selection. It’s a bit like ducking the question by redefining the terms. Much of our makeup is entirely by accident, and evolution is a story of filtered accidents. Creationists don’t like that — one of their central assumptions is that everything is purposeful — but don’t pander to their beliefs. Go for the gusto and ask them what their god was thinking when he loaded up your genome with the molecular equivalent of styrofoam packing peanuts, or when he ‘accidentally’ scrambled the sequence of our enzyme for synthesizing vitamin C.

Evolution in 5 minutes

OK, it’s cute and catchy, but it’s also got a very awkward sudden jump from the mammal-like reptiles to the primates, and unfortunately it perpetuates the “evolution as a process on rails” concept by showing a single lineage — ours, of course. Why not show a progression to a modern rose, or a fly, or a fish? Or better yet, illustrate evolution as an ongoing explosion of diversity? I know, I know, it isn’t as engrossing to self-centered humans, the market for this sort of thing.

Coyne is on the Loom

We had Neil Shubin here last week, and now Jerry Coyne is guest-blogging at The Loom. I look forward to the day that I can just sit back and invite prominent scientists to do my work for me here.

Although, I have to say that while Coyne is largely correct, he’s being a bit unfair. He’s addressing Olivia Judson’s recent article on “hopeful monsters”, a concept Coyne and the majority of the biological community reject. I reject it, too, but I think there are some legitimate issues that are associated with the idea that are also all too often and unfortunately discarded.

One point that Coyne handles well: there is a disconnect between the magnitude of genotypic changes and phenotypic effects — a single point mutation can cause amazing morphological changes. As Coyne points out, though, although this can happen, it’s not likely to be a major force in evolutionary change. Dramatic, single-step phenotypic effects are the kinds of things that geneticists select for, but they are also exactly the kinds of things that nature selects against. Evolution is much more likely to sidle up towards a major change by successive smaller steps, since those small changes are less likely to be accompanied by major deleterious side effects. Also, phenotypic outcomes of development should be robust to be advantageous, which typically means that there are many regulatory events cooperating to produce them — and they are therefore buffered by multiple controls.

But please, let’s not always dismiss Richard Goldschmidt when discussing “hopeful monsters”. It really wasn’t that awful an idea. Goldschmidt worked on stable variations in organisms: he studied sex differences (ever noticed that males and females have pretty much the same genes, but different phenotypes?) and metamorphosis (similarly, an organism builds two or more very different morphologies with exactly the same genome). He postulated that there could be specific, well-structured, stable nodes of patterns of gene expression — genes weren’t generally fluid, but tended to lock in to particular states. If he were writing today, he’d probably be bringing up the notion of attractors in chaos theory; the ideas are very similar. In that context, he was proposing a worthy concept that should have been taken more seriously than it was — Mayr’s hatchet job was particularly awful.

The “hopeful monster” concept was not shot down by the synthesis — it was ignored. I think it’s been dismantled by developmental biology, though; what we’ve learned is that the stable morphological types we see in a single species are not simply fortunate stable nodes in a nucleus that can be tuned in different ways, but that each are the product of many generations of slow sculpting by the processes of evolution, and that they are riddled with clumsy kluges that aren’t the outcome of some elegant global pattern switching mechanism, but of a long history of small tweaks.

Now also, Coyne is no fan of evo-devo, and he briefly voices the suggestion that the evolutionary developmental biologists are among the sources of this idea that saltational changes lead to sudden, drastic changes in body plans … but I’m just not seeing that. I am seeing work, for instance, that suggests that Hox duplications have been part of the process of producing additions to body plans, but it’s not a case of “poof, arthropods gain a metathorax in one change” — it’s been quite conventional. It’s more like “poof, arthropods gain an extra Hox gene, which initially adds redundancy and is later shaped by evolutionary processes that confer additional specializations on a segment,” quite ordinary stuff that shouldn’t be at all objectionable to Coyne.

It’s especially peculiar to pin the “hopeful monster” concept on evo-devo, when the one evo-devo expert he quotes, the biologist Sean Carroll, explicitly points out that evo-devo doesn’t support it.

Coyne is also going to be speaking at an evo-devo symposium I’ll be attending in April — I’m going to be very interested to hear what he has to say.

Guest post by Neil Shubin: preparing for TV

I thought it might be useful for the readers of Pharyngula to get my sense of the Colbert show experience.

Being a scientist on the show carries with it some challenges. We need to convey facts of science correctly and do so in a way reveals how fun our science is to do and to think about. We need to educate, enlighten, and excite. The challenge is we need to do this in 5 minutes with Stephen Colbert sitting across the table. To make matters worse, the show does not tell you the tack Colbert is going to take in advance, largely because so much of what he does is ad lib.

Because of this, I was terrified when I received the invitation last Fri. I took a few hours to accept, largely because I needed a family conference on the strike. Once I came to terms with my decision (the readers do a good in the commentary on the various issues that swirled for us), I began to prepare for the interview.

How did I prepare for the Colbert interview? In watching successful science interviews (of which there are a number of real good examples to emulate) I saw some general patterns to a successful visit. It also definitely appears that Colbert likes scientists and he want them to be able to tell their story.

The best answers I saw responded to Colbert’s questions with a sentence that captured the essence of the science in an entertaining way. So, the day of my interview I came up with a number such answers for the questions I thought I’d get. For the most part, I prepared with answers defending evolution vs. other non-scientific approaches.

I was pretty nervous before the interview, so much so that I didn’t sleep much the night before. And, as it turned out, my predictions about Colbert’s questions were largely wrong– Colbert didn’t even touch creationism and did a number of riffs on things that weren’t even in the book (like the final questions). I was aided, though, by the experience of preparing my answers. It exercised my brain in a way that allowed me to respond to the questions he really asked.

In thinking about the experience a few days later I have one thought on language. As scientists we are very used to using language with a great deal of precision (note the string in the commentary on common ancestry, group inclusion, etc.). The challenge is adapting our highly precise vocabulary to the demands of a five minute performance on a show which is fundamentally not about science. It is a tough tightrope to walk to balance between language that is both engaging and precise. I had mixed success, but that has to be our aspiration for these kinds of experiences.

You can ask the question, a valid one, why bother with these kinds shows? If it is so difficult, and the conceptual and linguistic apparatus of science doesn’t easily conform to this venue, why do it? For me the answer is that we need to make science part of the public conversation. We live in a society where Britany Spears latest foible gets more ink than Mello and Fire’s 2006 Nobel discovery of RNAi– a breakthrough on a little worm that will likely lead to treatments of many diseases. Something is wrong here.

Thanks for your comments and criticisms and I hope my personal experience gives some perspective.

Neil Shubin