BG bio

[Cream Soda]

Typing up a lab report and looked on google but couldn't find the answer to my question

Identify a homologous structure that shows morphological links between lobefin fishes and tetrapods.

[Omnipotent]

Typing up a lab report and looked on google but couldn't find the answer to my question

Identify a homologous structure that shows morphological links between lobefin fishes and tetrapods.

http://www.biocrawler.com/w/images/d/d7/Gyarados.png

?

[Cream Soda]

lol

[Plow]

Try typing your exact question into google, but "lobe fin" as 2 words.


I'm not sure what level you're talking about here but a basic answer is reeeeeally simple, I think.

[Andarvi]

Sarcopterygians - crossopterygians are bony fish with fleshy, lobed-paired fins, which are joined to the body by a single bone.[1] The fins of crossopterygians differ from those of all other fishes in that each is borne on a fleshy, lobelike, scaly stalk extending from the body. Pectoral and pelvic fins have articulations resembling those of tetrapod limbs. These fins evolved into legs of the first tetrapod land vertebrates, amphibians. They also possess two dorsal fins with separate bases, as opposed to the single dorsal fin of actinopterygians (ray-finned fishes). The braincase of sarcoptergygians primitively has a hinge line, but this is lost in tetrapods and lungfish. Many early sarcopts have a symmetrical tail.

If thats not enough detail look for further description on what those articulations are exactly.

[Cream Soda]

Thank you sir

[Plow]

I totally object to doing people's homework for them!

srsly tho, that question isn't even about the answer, it's seeing if you know what the question is actually asking, I'm sure the answer itself is literally written out in your required studies somewhere

[Cream Soda]

I totally object to doing people's homework for them!

srsly tho, that question isn't even about the answer, it's seeing if you know what the question is actually asking, I'm sure the answer itself is literally written out in your required studies somewhere

Considering at the beginning of the assignment, it says "you may need to look online to answer some of these" and the fact I don't have a text book (different teacher for lab and lecture, this is a lab assignment, lecture teacher doesn't require book), probably not, lol.

[Plow]

Well, even so, the answer is discussed fairly extensively in the first result on google for "lobe fin fish tetrapod" (without the quotes) once you understand what you're looking for.

Hence why I don't think someone should just give you the answer.

[Restrat]

lungs evolved into gas bladders in fish

[Flarega]

May not be a direct answer, but you could talk about the similarities in the embryos between the two species.

[Senoska]

http://www.biocrawler.com/w/images/d/d7/Gyarados.png

?

http://i42.tinypic.com/1y5pb6.gif
http://tinypic.com/?t=postupload

[kuronosan]

I can't help but feel like you have some serious problems in this course if you have to constantly have to ask everyone here for help.

Then again, I also remember what it's like to not know something that other people may know.

Sorry, can't be of any help here.

[Eggroll]

As others have said, your best bet is probably to talk about the differences in pelvic/pectoral girdles between Sarcopterygii and primitive tetrapods such as Leospondyls. The ribs are also good to look at, because ventrally projecting ribs began to appear which allowed organisms to support their body weight outside of water. Lungs also first occured in Dipnoans as a preadaptation, so your instructor will likely take that as an answer as well.

[Cream Soda]

I can't help but feel like you have some serious problems in this course if you have to constantly have to ask everyone here for help.

Then again, I also remember what it's like to not know something that other people may know.

Sorry, can't be of any help here.

Lol I think this is my maybe third question over the course of the semester on this class, xD. Wouldn't really call that constantly, but if you must know, I had 5 tests last week and three exams coming up this week. The lab report wasn't on the top of my priority list.

[kuronosan]

Yea, sorry dude. Most of my rant was stress-induced. I just wish I had a big book of "Here you fucking goes" to help you along. It really makes me question the quality your teacher's teaching if you have to go to a message board for help.

It's like your teacher keeps asking you questions that a textbook really should be having the answers to. Not the internet. It's like a psych major doing research on family living by looking up tabloids on Kate Gosselin.

[Cream Soda]

Oh, you can't ever get a hold of that teacher. He's teaching 21 credit hours. If you want office time, you gotta make an appointment at least a week in advanced, which does nothing in this case, as the lab reports are due weekly.