You have returned to college to become a phylogeneticist. One of the

You have returned to college to become a phylogeneticist. One of the first things you wish to do is determine how mammals, birds, and reptiles are related.

Like any good scientist, you need to consider all available data objectively and without a preconceived “correct” answer. In pursuit of that, you should produce a phylogenetic tree based only on morphological features that show birds and mammals are more closely related. You will then produce a totally different tree, also using morphological features, that shows birds and reptiles are more closely related. Do not forget to include all three groups in both your trees.

Based solely off the trees you produce, which relationship would you consider the more likely and why? Once you have answered that question, provide a brief summary of the “modern” understanding of the relationship between these three groups.

Rubric: Morphological Phylogenetics

Criteria

Ratings

Pts

Mammalian/avian tree is provided

Tree includes full relationship with all 3 groups sharing multiple characteristics until the mammal/bird split from reptiles

Tree includes relationships between all 3 groups on a minimal number of features

Tree does not include all 3 groups

3 pts

Reptilian/avian tree is provided

Tree includes full relationship with all 3 groups sharing multiple characteristics until the reptile/bird split from mammals

Tree includes relationships between all 3 groups on a minimal number of features

Tree does not include all 3 groups

3 pts

One tree is identified as most likely

Discussion outlines multiple features for the “chosen” tree

Discussion outlines at least 1 reason for the chosen tree

Discussion does not use the trees to argue for a closer relationship

3 pts

Modern understanding is discussed

At least 2 pieces of modern evidence (not only morphological) is discussed

Modern evidence is discussed

Modern evidence is not discussed or the current relationships are not properly identified

3 pts

Total points: 12

Due Date

Oct 23, 2022 11:59 PM

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Rubric Name: Morphological Phylogenetics

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Criteria

Level 3

3 points

Level 2

2 points

Level 1

1 point

Criterion Score

Mammalian/avian tree is provided

Tree includes full relationship with all 3 groups sharing multiple characteristics until the mammal/bird split from reptiles

Tree includes relationships between all 3 groups on a minimal number of features

Tree does not include all 3 groups

Score of Mammalian/avian tree is provided,

/ 3

Reptilian/avian tree is provided

Tree includes full relationship with all 3 groups sharing multiple characteristics until the reptile/bird split from mammals

Tree includes relationships between all 3 groups on a minimal number of features

Tree does not include all 3 groups

Score of Reptilian/avian tree is provided,

/ 3

One tree is identified as most likely

Discussion outlines multiple features for the “chosen” tree

Discussion outlines at least 1 reason for the chosen tree

Discussion does not use the trees to argue for a closer relationship

Score of One tree is identified as most likely,

/ 3

Modern understanding is discussed

At least 2 pieces of modern evidence (not only morphological) is discussed

Modern evidence is discussed

Modern evidence is not discussed or the current relationships are not properly identified

Score of Modern understanding is discussed,

/ 3

Total

Score of Morphological Phylogenetics,

/ 12