Typo on Final

[Yonah Ziemba]

Hi All,

I think there was a typo on today's Biology Final.
Version 1 Question 66: Which of the following are uninformative? Answer Choice C: All but 1 and 2.
The double negative implies that only 1 & 2 are INformative; in reality only these are UNinformative.
(I may be mistaken with the Question and Version number.)

(I emailed Prof. Velhagen; he didn't reply yet.)

There was one more that seemed mistaken or unfair. I just don't remember it.

Any thoughts?

[Hayley Weinberg]

You are right about C, but if I'm remembering correctly choice D was:
All but 4 and 5. Meaning 1 and 2 were uninformative, as you said (as
well as 3 and 4). I think this seemed like a reasonable answer... but
now I can't even remember if 3 and 4 were informative or
uninformative, so I could be remembering this all wrong. Anyone else
have a better memory than me that can clarify?

--
Hayley Weinberg
hrwei...@gmail.com
(516) 987-7933

[Amanda Thurm]

i believe 3 and 4 were ones that were at a tip, and in class, DeSalle said those were uninformative as well as...

[Hayley Weinberg]

That's what I thought too. In which case D is the right answer and
the wording of C was confusing, but not a typo. Again, could be
remembering this wrong though

[Jonny Wong]

yea all except 5 and 6 were uninformative. 3 and 4 are apomorphies (originate in only one of the tips) which are also uninformative (along with simplesiomorphies, i.e. shared and ancestral characters). if you noticed, 3 and 4 resulted in the same amount of steps for all three trees (1 step for each character), which proves they are uninformative. hope this helps.

Jonny

On Wed, Dec 22, 2010 at 12:58 PM, Amanda Thurm <amanda...@gmail.com> wrote:

[Jonny Wong]

sorry i meant 3 and 4 are AUTapomorphies. apomorphy is a more general term.

[Susan E Chang]

I put "all but 5/6", but the double neg. could have screwed me on that one..?

I thought there was a typo too-- in the ring-species question, it asked which is not true (aka false): the ends species always mate OR the end species can not mate. both of these seemed like good answers, as both are false.?? or did i read that totally wrong? I thought the end species can mate, but dont necessarily have to.

[Amanda Thurm]

i thought that ring question was worded oddly too.  i wasn't sure which of those to pick so i think i put the one that said always since always is such a "strong" word.

[Jonny Wong]

The end species always mate is false and is therefore the right answer. In the example of the lizards he gave us in class, the species on the northern and southern tips CANNOT mate with each other, so this is true, making it the wrong answer.