(Question above)
... And all I got was this stupid X-Shirt.
Look at humans for example. If you go down the middle, you'll notice both sides are, at least roughly, symmetrical. This isn't the case with human organs, which are not organized in a symmetrical pattern, but are (seemingly) located all over the place. So how does one explain the absence of internal bilateral symmetry? If external bilateral symmetry is evolutionarily advantageous, why isn't internal bilateral symmetry?
For example, Spider-Man's typical appearance has bilaterial symmetry β his left side looks identical to his right side. Metamorpho would be a good example of someone who lacks bilateral symmetry.
"Accessories" β Captain America's shield being held on one arm, Punisher's rifle slung across his back, or Green Lantern's ring on an appendage β doesn't count. Minor details (e.g., the slider on a zipper being on one side of an open jacket) don't count. Superman's "S" shield or Guy Gardner's vest would technically count but I'm looking for something more substantial than that.
Structural symmetry is more of an emergent phenomenon than something that is hard-coded into the genes, but phyla that have left-right symmetry in common presumably have common genes that are conserved (more than genes shared with all life, less than let's say genes shared among primates). Are any of the genes shared among bilateral animals associated with structure in some way?
my professor asked this question, I wanna say it just cause complex animals display bilateral symmetry. seems like a weird way to ask a question. how would you answer this?
edit: thanks to everyone who for there input :)
And all they brought me was this lousy F-shirt.
Why have humans (and for that matter much of the animal kingdom) evolved to have visible bilateral symmetry but not internal? I.e., why do we and other animals look symmetrical on the outside but not as much internally)? I'm guessing it has something to do with sexual selection for symmetry?
What do plastic surgeons base their aesthetic judgements off of (besides the patient's opinions)? Do they get to study articles on the sociobiological perception of beauty in med school? I'd really like to read some of those; I've been watching this YouTube channel and I find its insights endlessly fascinating.
Also do other mammals favor one side over the other?
And it's not even my size.
At least, on the outside. I don't know if it applies to the internal organs too.
I'm wondering if anyone has seen anything to indicate that lifeforms will not be restricted to bilateral symmetry. All the footage I've seen shows symmetrical animals, most with 2 or 4 appendages (plus the sandworm and flying rays of course).
I'm just hoping that as you get towards the center, stuff gets weirder than that.
My son wrestles for his middle school. This is his 2nd year. He's really taken off with his intensity and determination this year and, as such, I am attempting to support him in my best geek fashion by helping him with resources.
I used to swim in high school. Being left handed, for a long time I would only roll for breath on left stroke. When I broke down and began using both sides for breath rolls was I able to begin bringing my time down significantly. Many shot instruction videos show it from only one side, I am assuming their dominant side. Is it advantageous or recommended that shot practice be bilateral? Or is that what duck walking is for?
my features, and my facial bone structure itself, are quite asymmetrical. one eye, brow, cheekbone, and lip corner are higher than their corresponding part on the the other side, and my jawline is narrower on one side. it's nothing crazy, and i'm okay with it- i just wondered if there's any way one can use makeup to make features and overall face shape look more symmetrical. i'm already familiar with contouring and highlighting and thought perhaps something along those lines could make a difference if applied in a specific way?
