How limbs form from genes

[Brightmoon]

The details ! It’s a film by a developmental biologist and goes over how genes get reused to form limbs in bilaterians. It’s about 40 minutes long and with that sexy title it won’t be hard to find

 

[mark kennedy]

I had to look it up on Youtube, found a link that worked better for me:

Yet another homology argument from a Humanist, that's novel. Nature as a tinkerer, I guess he did find at least an appealing analogy.

 

[Brightmoon]

But this IS how genes work to form limbs . Evo Devo is fun because they can recreate an ancestral form by tweaking the genes in a modern organism. This means that they can work out the steps involved in how organism A evolved into organism B

Thanks for the link

 

[Occams Barber]

View attachment 255008 The details ! It’s a film by a developmental biologist and goes over how genes get reused to form limbs in bilaterians. It’s about 40 minutes long and with that sexy title it won’t be hard to find

I remember coming across the concept of biological exaption in an article I read around 40 years ago. The metaphor used to explain it was based on the dome of a typical medieval cathedral. The structural arches of the dome come together and in the process leave open triangular areas of the internal dome surface between the arches. These openings came to be used as the locus for religiously themed paintings or exotic patterning. Although not initially designed for painting, they became 'exapted' (i.e., co-opted) for artwork. Looking at the incredible artwork in these church/mosque domes it's easy to imagine that the dome was specifically designed to house the art.

Bricolage and deep homology are concepts I hadn't come across - thanks @Brightmoon.
OB

 

[Brightmoon]

( Snip)

Yet another homology argument from a Humanist, that's novel. Nature as a tinkerer, I guess he did find at least an appealing analogy.

did you actually watch the video? He summarized a lot of complex information that biologists know that maybe laymen don’t

 

[mark kennedy]

did you actually watch the video? He summarized a lot of complex information that biologists know that maybe laymen don’t

I browsed it, if I were taking it seriously I would have went to the paper it's all based on. Really don't have the patience for it these days because it's tiresome to do the reading to have the conversation to be reduced to pedantic rationalizations. If he identified the genes I didn't see it but then again, I didn't spend a great deal of time sorting it out.

 

[Brightmoon]

He did identify the genes but you probably skipped over that part as their individual names aren’t important to briefly summarise how limbs form . This is decades old research no reason to reinvent the wheel. There’s a whole slew of genes that work to produce limbs

 

[xianghua]

. This means that they can work out the steps involved in how organism A evolved into organism B

i dont think so. they cant tell how many mutations are needed to such a transformation. unless you can show that number.

 

[Jimmy D]

Lol, off topic but an appropriate advert appeared under Occam’s dome post....

 

[Brightmoon]

i dont think so. they cant tell how many mutations are needed to such a transformation. unless you can show that number.

For some traits they can show the genetic steps as to how it formed. Some genetic step are missing if the lineage is very old . This why it was such a shock when we realized that the make-an-eye-here gene was the same in all bilaterians and that it still worked in other species than the one they got it from

 

[Speedwell]

i dont think so. they cant tell how many mutations are needed to such a transformation. unless you can show that number.

It would be hard to do because mutations aren't the only cause which generate the randomly distributed phenotypic variation on which natural selection acts.

 

[tas8831]

i dont think so. they cant tell how many mutations are needed to such a transformation. unless you can show that number.

How many licks does robot-penguin take to get to the center of the tootsie-pop?