evolution/cladogram analysis
1. define \evolutionary adaptation\. list 3 organisms and describe an adaptation that increases their fitness.
2. differentiate between natural selection, artificial selection, and sexual selection. give examples of each.
3. briefly describe 3 pieces of evidence for evolution.
4. what trait separates lampreys from tuna on this cladogram?
5. what separates a salamander from a turtle?
6. which organism is most related to the leopard?
7. which organism’s dna will differ the most from the leopard? why?
cladogram: lancelet (outgroup), lamprey, tuna, salamander, turtle, leopard; traits: vertebral column, jaws, four walking legs, amniotic egg, hair

Question

Accepted Answer

### Question 1: Define "EVOLUTIONARY ADAPTATION" and list 3 organisms with their adaptations.
# Brief Explanations:
**Evolutionary Adaptation** is a heritable trait (physical/behavioral/physiological) that enhances an organism’s survival and reproduction in its environment.

- **Cactus**: Thick, waxy skin and spines reduce water loss (adaptation to arid deserts).
- **Giraffe**: Long neck allows feeding on tall tree leaves (adaptation to savanna vegetation).
- **Polar Bear**: Thick fur and blubber insulate against cold Arctic temperatures (adaptation to frigid climate).

# Answer:
Evolutionary Adaptation: A heritable trait that improves an organism’s fitness (survival/reproduction) in its environment.
Examples:
1. Cactus – Thick skin/spines (reduces water loss in deserts).
2. Giraffe – Long neck (accesses tall tree leaves in savannas).
3. Polar Bear – Thick fur/blubber (insulates in Arctic cold).

### Question 2: Differentiate Natural, Artificial, and Sexual Selection (with examples).
# Brief Explanations:
- **Natural Selection**: Environment (e.g., climate, predators) selects traits for survival/reproduction. Example: Peppered moths (dark moths survived better in polluted forests).
- **Artificial Selection**: Humans select traits for desired outcomes (e.g., dog breeding for size/temperament). Example: Cabbage, broccoli, kale from wild mustard (human-guided selection).
- **Sexual Selection**: Traits enhance mating success (attract mates or compete for them). Example: Peacock tails (attract females) or deer antlers (compete for mates).

# Answer:
- **Natural Selection**: Driven by environmental pressures (e.g., peppered moths’ color change in polluted forests).
- **Artificial Selection**: Driven by human preferences (e.g., breeding dogs for specific traits like size or loyalty).
- **Sexual Selection**: Driven by mating advantages (e.g., peacock’s elaborate tail to attract females).

### Question 3: 3 pieces of evidence for evolution.
# Brief Explanations:
1. **Fossil Record**: Shows gradual changes (e.g., horse evolution from small, multi-toed ancestors to modern horses).
2. **Homologous Structures**: Similar anatomy (e.g., human, bat, whale forelimbs) indicates common ancestry.
3. **DNA Similarities**: Closely related species (e.g., humans and chimps) share more DNA, showing evolutionary relationships.

# Answer:
1. Fossil Record (e.g., horse evolution).
2. Homologous Structures (e.g., vertebrate forelimbs).
3. DNA Similarities (e.g., human-chimp DNA overlap).

### Question 4: Trait separating lampreys from tuna on the cladogram.
# Brief Explanations:
From the cladogram, lampreys branch before “Jaws,” while tuna branch after. Thus, **jaws** is the trait separating lampreys (no jaws) from tuna (has jaws).

# Answer:
The trait is **jaws** (lampreys lack jaws; tuna have jaws).

### Question 5: Trait separating salamander from turtle.
# Brief Explanations:
From the cladogram, salamander branches before “Amniotic egg,” while turtle branches after. Thus, **amniotic egg** (turtles have amniotic eggs; salamanders do not) separates them.

# Answer:
The trait is **amniotic egg** (turtles have it; salamanders do not).

### Question 6: Organism most related to leopard.
# Brief Explanations:
On the cladogram, leopard and turtle share a more recent common ancestor (branch after “Amniotic egg” and “Hair” is unique to leopard, but turtle is closer than salamander/tuna/lamprey). Wait, correction: The cladogram shows leopard’s branch is after “Hair,” but the closest relative is the one with the most recent common node. Wait, the cladogram order: Lancelet → Lamprey → Tuna → Salamander → Turtle → Leopard. Wait, no—nodes: After “Amniotic egg,” the next node is “Hair” (leopard). So the turtle is the closest before leopard (since they share the “Amniotic egg” node, then leopard splits with “Hair”). So **turtle** is most related (shares more recent common ancestor than salamander/tuna/lamprey).

# Answer:
The turtle is most related to the leopard (shares a more recent common ancestor).

### Question 7: Organism with DNA most different from leopard (and why).
# Brief Explanations:
DNA difference correlates with evolutionary distance (time since common ancestor). The lancelet is the outgroup (most distantly related), followed by lamprey, tuna, salamander, turtle. So **lancelet** (or lamprey) has the most different DNA, as it shares the least recent common ancestor with leopard.

# Answer:
The **lancelet** (outgroup) has DNA most different from leopard. Reason: It is the most distantly related (longest time since common ancestry, so more genetic changes accumulated).

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

Question 1: Define "EVOLUTIONARY ADAPTATION" and list 3 organisms with their adaptations.

Answer:

Question 2: Differentiate Natural, Artificial, and Sexual Selection (with examples).