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1. what trait separates lampreys from tuna? 2. what separates a salaman…

Question

  1. what trait separates lampreys from tuna?
  2. what separates a salamander from a turtle?
  3. which organism is considered the oldest?
  4. how do you know it is the oldest?
  5. which organism is most closely related to the leopard?
  6. how do you know it is the most closely related?
  7. which organism dna will differ the most from the leopard?
  8. why?

Explanation:

Response

To solve these questions, we analyze the phylogenetic tree:

Question 1: What separates lampreys from tuna?

The tree shows lampreys branch off before the “Jaws” trait. Tuna have jaws, lampreys do not. So the trait jaws separates them.

Question 2: What separates a salamander from a turtle?

The tree shows turtles have the “Amniotic egg” trait, while salamanders (under “Four walking legs” but before “Amniotic egg”) do not. So the trait amniotic egg separates them.

Question 3: Which organism is considered the oldest?

In a phylogenetic tree, the organism with the earliest branch (closest to the root) is the oldest. The “Lancelet (Amphioxus)” branches first (closest to the root), so it is the oldest.

Question 4: How do you know it is the oldest?

The oldest organism branches off first (earliest divergence) from the common ancestor. The lancelet’s branch is the first (closest to the root) among all shown, indicating it diverged earliest.

Question 5: Which organism is most closely related to the leopard?

Organisms sharing the most recent common ancestor are most related. The leopard and turtle? No—wait, the leopard is under “Hair,” and looking at the tree, the turtle is before “Hair,” but wait, no: Wait, the tree has branches: After “Amniotic egg,” there’s a branch for turtle and then “Hair” for leopard? Wait, no, re-examining: The tree’s last branches: Turtle, then Leopard (with “Hair”). Wait, no, the labels: After “Amniotic egg,” one branch is Turtle, the other leads to “Hair” and Leopard. Wait, no—actually, the closer the branches, the more related. Wait, the leopard is on the “Hair” branch, and the turtle is on a branch before “Hair.” Wait, no, maybe I misread. Wait, the tree: Vertebral column → Jaws → Four walking legs → Amniotic egg → then a branch: one to Turtle, one to Hair → Leopard. So the turtle and leopard share a common ancestor at “Amniotic egg,” but wait, no—wait, the “Amniotic egg” is a trait, then the next split: one lineage to Turtle, the other to “Hair” and Leopard. So the Leopard’s closest relative here (among the options) would be... Wait, the options are Lancelet, Lamprey, Tuna, Salamander, Turtle, Leopard. Wait, the tree: Lancelet (first), Lamprey, Tuna, Salamander, Turtle, Leopard. Wait, no, the branches: After “Four walking legs,” we get “Amniotic egg,” then split into Turtle and (Hair → Leopard). So the Turtle and Leopard share a more recent common ancestor than, say, Salamander and Leopard. Wait, but the question is “which organism is most closely related to the leopard”—among the listed? Wait, the organisms are Lancelet, Lamprey, Tuna, Salamander, Turtle, Leopard. So the Leopard’s closest is Turtle? No, wait, the branch after Amniotic egg: one is Turtle, the other is Hair → Leopard. So they share the Amniotic egg ancestor, then diverge. So Turtle is more closely related to Leopard than Salamander (which is before Amniotic egg), Tuna (before Jaws? No, Tuna is after Jaws), Lamprey (before Jaws), Lancelet (earliest). So Turtle is most closely related to Leopard (among these).

Question 6: How do you know it is the most closely related?

Closely related organisms share a more recent common ancestor (i.e., their branches diverge later). The Leopard and Turtle share the “Amniotic egg” ancestor, and their branches diverge after that, while others (like Salamander) diverge earlier. Thus, they have a more recent common ancestor.

Question 7: Which organism’s DNA will differ the most from the leopard?

The organism with the earliest divergence (oldest, most distant) will have the most DN…

Answer:

s (matching each question):

  1. Jaws
  2. Amniotic egg
  3. Lancelet (Amphioxus)
  4. It branches first (earliest divergence) from the common ancestor.
  5. Turtle (or, if re-evaluating, maybe a misread—wait, the tree: after Amniotic egg, Turtle and then Hair → Leopard. So Turtle is closest. Alternatively, if “Hair” is a trait, maybe the Leopard’s closest is... Wait, the options: the organisms are Lancelet, Lamprey, Tuna, Salamander, Turtle, Leopard. So Turtle is most closely related.
  6. They share a more recent common ancestor (branches diverge later).
  7. Lancelet (Amphioxus)
  8. It diverged earliest, so more time for DNA changes.