A scientist is attempting to build a cladogram that shows the evolutionary closeness of three organisms in relation to humans. After doing DNA analysis, they determine that the organisms share the following percentages of DNA:

Question

Organism A and humans share 85% of their DNA.

Organism B and humans share 80% of their DNA.

Organism C and humans share 90% of their DNA.

Based on this information, which order should they go on the cladogram (from least related to most related)?

(1 point)
Responses

C, A, B, humans
C, A, B, humans

A, B, C, humans
A, B, C, humans

B, A, C, humans
B, A, C, humans

C, B, A, humans

Answer 1

To determine the order of organisms in relation to humans based on their shared DNA percentages, we should look at the percentages of DNA shared:

• Organism A: 85% shared with humans
• Organism B: 80% shared with humans
• Organism C: 90% shared with humans

The order of these organisms from least related to most related to humans based on the percentage of shared DNA is:

1. Organism B (80%)
2. Organism A (85%)
3. Organism C (90%)

Then, we include humans at the end since they are the focal point of the cladogram.

Therefore, the correct order from least related to most related is:

B, A, C, humans.