A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 4 years ago

Building a Phylogenetic Tree: There are some groups that have no subset of another group... Help!! Please!!

  • This Question is Closed
  1. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Group Derived Traits PBL 4-CH MG P PL CT Wolf + + + - + + Iguana + - - - - - Human + + + - + - Wombat + + + + - - Tiger + + + - + + Ostrich + + - - - - Fish - - - - - - PBL: Paired bony limbs 4-CH: Four-chambered heart MG: Mammary glands P: Pouch PL: Placenta CT: Carnassial teeth

  2. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Wolf, Iguana, Human, Wombat, Tiger, Ostrich all have PBL. Human, Wombat, Tiger, Ostrich all have 4-CH. Human, Wombat, Tiger all have MG. and then I am stuck...

  3. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    The 4 chambered heart in the ostrich is convergent. The others are mammals.

  4. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    convergent? What do you mean? So what does that mean? D:

  5. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    A 4 chambers heart evolved independently in the lineage leading to ostriches and the lineage leading to the other three. Homoplasy is another word for the same process.

  6. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    how did it evolve independently in the lineage and how did you recognize it?

  7. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    How did it evolve is a long and complicated answer. How do you recognize it is more straightforward. Look at the character states for MG, P, PL, and CT. All of those agree for Iguana and Ostrich. So that tells you that Iguanas and Ostriches should be closely related. Wolf, human, and tiger all have a placenta, so you know those are closely related. Those 3 share mammary gland with wombat, so those 4 should be a group. Now you have 2 choices. Either the ostrich goes with the wolf, human, and tiger group and the placenta is lost in ostrich. Or the heart is convergent. Based on all the shared characteristics between iguana and ostrich, it's more likely that the ostrich goes with iguana, and thus the 4 chambered heart evolved separately.

  8. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I think I'm getting it.. is it possible for you to make the tree? ahh, I hope it's nto too much to ask D;

  9. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Give it a try. I know the tree, so me making it for you won't help you in the long run.

  10. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    can I show it to you? when I finish?

  11. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Sure

  12. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Ahh, omg. My unit guide says I should read this website: http://evolution.berkeley.edu/evolibrary/article/0_0_0/phylogenetics_07, and I did and the Phylogenetic tree looks simple... and I tried the question I have above: |dw:1327367282756:dw|

  13. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ahhh, I tried following what the website says and what you said about convergent but aww man.

  14. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Wolf is there twice. Make the lefthand wolf a fish. Move the human up by the wolf and tiger.

  15. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    why should I make the lefthand wolf a fish? when it doesn't have a paired bony limbs? and move the human up by the wolf because it has carnassial teeth? o.o

  16. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Yes for the fish. It's the most primitive of those (it has none of the features). Humans go with tigers and wolves because all have placentas. Then tigers and wolves go together because they have carnassials.

  17. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ohhh, .. i'll create another tree and see o.o

  18. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1327371458330:dw|

  19. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ahhh.

  20. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i don't know.. anymore D: One of my friends said the tree won't rise because all of the animals have different traits not the same traits before they branch out..

  21. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    It's been a long while since I've had to do a phylogenetic tree, but I'll give this a shot. When building the tree you have to look at what the organisms have in common and what is different. 1. Everything but fish has PBL, suggesting that the fish broke off before PBL occurred. |dw:1327395340629:dw| 2. Of the animals left, everything but the Iguana has the 4-chambered heart, so the iguana broke off before the 4-chambered heart. 3. Of the animals left, everything but the ostrich has mammary glands, so the ostrich broke off before the gland. |dw:1327395579464:dw| 4. Of the organisms left, the wolf, tiger, wombat, and human, the next most noteworthy trait is a difference...rather than the commonalities that we noted before. The wombat is the only thing with a pouch. This suggests that the trait developed separate of the main tree, on its own branch. |dw:1327396071405:dw| 5. The human, tiger and wolf all have the placenta, so that trait developed after the wombat branch broke off. 6. The wolf and tiger both have Carnassial teeth, while humans do not. Knowing this, we can complete the chart. |dw:1327396333912:dw| |dw:1327396387254:dw|

  22. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.