Phylogeny Video Lessons

Concept

# Problem: Use these critters to answer the following questions.a) Construct a taxon by character matrix for the above organisms(i) presence/absence of hair(ii) presence/absence of stripes (iii) presence/absence of spots(iv) presence/absence of eye(v) presence/absence of fins(vi) presence/absence of tail(vii) presence/absence of jawiiiiiiivvviviiOABCDEFPresence +          Absence -b) Draw the most parsimonious cladogram for the below taxa, mapping out all 7 characters onto the tree. Then chose a node, circle it, and rotate it along that node by drawing a second tree that shows identical phylogenetic relationships.

###### FREE Expert Solution

For a) The character matrix should look like this:

 i (hair) ii (stripes) iii (spots) iv (eye) v (fins) vi (tail) vii (jaw) O – – – – – – – A + – + + – – + B – + – + – + + C – – – + + – + D + + + + – – + E – – – + + + + F – – – – – – +

###### Problem Details

Use these critters to answer the following questions.

a) Construct a taxon by character matrix for the above organisms

(i) presence/absence of hair

(ii) presence/absence of stripes

(iii) presence/absence of spots

(iv) presence/absence of eye

(v) presence/absence of fins

(vi) presence/absence of tail

(vii) presence/absence of jaw

 i ii iii iv v vi vii O A B C D E F

Presence +          Absence -

b) Draw the most parsimonious cladogram for the below taxa, mapping out all 7 characters onto the tree. Then chose a node, circle it, and rotate it along that node by drawing a second tree that shows identical phylogenetic relationships.