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/sci/ - Science & Math

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File: 239 KB, 1920x1080, Screenshot 2014-04-19 14.16.11.png [View same] [iqdb] [saucenao] [google]
6488827 No.6488827 [Reply] [Original]

I need to order these made up "Crawlas" in a phylogenetic tree. All I have to go on is what they look like and the time period of their fossils. I have 2 possibilities for the tree however, I not even sure how it's supposed to be done. One of them is just straight up chronology and the other shows possible evolutions. Any ideas on how to do this?

>> No.6488832
File: 234 KB, 1920x1080, Screenshot 2014-04-19 14.11.55.png [View same] [iqdb] [saucenao] [google]
6488832

>>6488827
This is the chronology one.

>> No.6488850

>>6488832

>homework
>winshit
>MS Publisher (LAWL)

just go away kid.

>> No.6488986
File: 127 KB, 500x654, scientific-american.jpg [View same] [iqdb] [saucenao] [google]
6488986

>>6488827
Use the organism from the earliest time period to root the tree and then just bifurcate it based on how similar their morphology is. Ordering by chronology is completely wrong (try ordering every organism on earth to produce a tree that makes no sense). The one in the OP doesn't make sense because each node only has one branch. Also there's a random branch that doesn't lead to anything in both pictures.

This is a pretty horrible way of teaching phylogenetics and there are multiple ways to do this. Get more information.