Chordates

[bluesdeluxe]

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came across this question on the practice test posted here

I haven't had embryology which always kills me on this test but can anyone explain this?

Barrons says chordatas have "notochord, nerve cord, and pharyngeal slits"
are pharyngeal slits and a pharynx different and if they have a nerve cord would't they have a vertebral column? I went with A when it's B

 

[armorshell]

If embryology is killing you so much maybe you should study it a little harder...

 

[issa]

came across this question on the practice test posted here

I haven't had embryology which always kills me on this test but can anyone explain this?

Barrons says chordatas have "notochord, nerve cord, and pharyngeal slits"
are pharyngeal slits and a pharynx different and if they have a nerve cord would't they have a vertebral column? I went with A when it's B

i didn't choose A because pharynx is different in chordata. i always think of it as a mouth and anus in platyhelmenthes.

 

[Prayin80]

pharyngeal slits are gill slits. they are different from the pharynx. When they say vertebral column, they are refering to the spinal columns. Hope this helps.
😀

came across this question on the practice test posted here

I haven't had embryology which always kills me on this test but can anyone explain this?

Barrons says chordatas have "notochord, nerve cord, and pharyngeal slits"
are pharyngeal slits and a pharynx different and if they have a nerve cord would't they have a vertebral column? I went with A when it's B

 

[tom_servo_dds]

pharyngeal slits are gill slits. they are different from the pharynx. When they say vertebral column, they are refering to the spinal columns. Hope this helps.
😀

Good explanation and great job on your scores there Prayin80! 👍 Best of luck with applications.

 

[wigglytooth]

Remember, a chordate doesn't have to have a spinal column. I think the spinal column thing is a typical "trick" test makers try to use when they ask about chordates. http://en.wikipedia.org/wiki/Amphioxus is a representative from chordata that does not have a spinal column. In sum, a chordate must have the following attributes:

-Notochord
-Pharyngeal slits
-Post anal tail
-Dorsal nerve chord

 

[wlee009]

I agree with wigglytooth. Phylum chordata includes many subphyla such as urochordata, cephalochordata, and vertebrata. Presence of vertebral column is a characteristic of subphylum vertebrata, but other subphyla of chordata, such as urochordata or cephalochordata, do not have this characteristic.