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Question 31646

posted 1 years ago

Consider the tree below that was obtained by doing the Growing Tree exercise. Which traits do you expect to differ between the flowers on Peak 4 and those of the common ancestor of all populations? Select all that apply.
stripes
spur length
petal tips
petal colour
spur colour
anthers
blade colour
stigmas

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Question 31649

posted 1 years ago

Your classmate says that when they ran their simulation,anthers were the first trait to mutate (from white to yellow).When you tell your classmate that in your tree the anthers did not mutate after 800 years, they indicate that they think you did something wrong. What would you tell your classmate?Choose the answer that best fits this situation.
"You are right. All of the mutations should show up within 800 years."
"Hmmm. I guess I did do something wrong. My tree should be the same as yours."
"Every simulation is different, and the mutations arise at random. It is completely possible that another colour might not mutate at all."

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Question 31650

posted 1 years ago

Given your experience with playing around building trees,evaluate the statement below:
The structure of the phylogenetic trees tell us something about the order in which the peaks were colonized.

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Question 31651

posted 1 years ago

Consider the tree of columbines below. Given what you see here, which peak had columbines on it first?
Peak 1
Peak 4
Peak 3
Peak 2

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Question 31653

posted 1 years ago

In the Tree Building Challenge exercise, please use the following steps to build a tree. Identify which tree of the options below is the one that you constructed.
1. Start on Peak 1. Reset the simulation until you get to this starting point.
2. Let some time pass.
3. Move a flower from Peak 1 to Peak 3
4. Let some time pass.
5. Move a flower from Peak 3 to Peak 4
6. Let some time pass.
7. Move a flower from Peak 1 to Peak 2.
8. Let some time pass.

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Question 31654

posted 1 years ago

Imagine you started the Tree Building Challenge with columbines starting on Peak 2 (HINT - you can actually do this by resetting the simulation until they start there!). Which of the following steps could be involved in making the tree below (the same one from the workbook)? Select all that apply- they might not be in order, but that's okay. Just pick the ones that you would actually have to do to build the correct tree.THERE MAY BE MORE THAN ONE WAY TO BUILD THIS TREE!!That's okay. Just choose from the steps that would work to make this happen.
peak 3-> peak 1
\text { peak 2 -> peak } 3
\text { peak 3 ->peak } 4
\square \quad \text { peak 1 -> peak 4 }
peak 1-> peak 2
\Gamma \quad \text { peak } 2->\text { peak } 1

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Question 31655

posted 1 years ago

Consider the three trees below. One of them has different evolutionary relationships among the four peaks than the other two. Which one is it?
Tree BC'
Tree C
Tree A

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Question 31656

posted 1 years ago

The tree below is the one that you are looking at (or should be!) for this exercise. Your classmate says that if you rotate around the node that joins Peaks 1 and 4, the flowers on Peak1 will have blue spurs. What would you say about this?
"If you do this, then both Peak 1 and Peak 4 columbines will have blue spurs"
"Rotating nodes does not change the evolution of the traits on the tree"
If I rotated around the node that joins Peaks 1, 3 and 4
There is no way this can change

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Question 31657

posted 1 years ago

Question 1.4 in this exercise asks about whether the timing of a trait change (in this case dark petals) differs when you rotate the tree around the nodes (your answer to this should be NO!). What would alter the timing of a trait change?
If the simulation was run again and I allowed the columbines to evolve for different numbers of generations before I made the mutation happen
If I rotated around the node that joins the columbines on all four peaks
If I rotated around the node that joins Peaks 1, 3 and 4
There is no way this can change

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Question 31658

posted 1 years ago

Consider the tree that you are working with (shown here again so you don't have to scroll around!). What is the order that trait change occurred in the group of columbines, starting at the one that happened earliest?
spur colour
anthers
petal tips
petal colour

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