* Hemoglobin is a highly conserved protein: Hemoglobin is essential for carrying oxygen in the blood. Its structure and function are crucial for survival, making it highly resistant to mutations that could disrupt its ability to do its job.
* One amino acid difference is small: A single amino acid change is a relatively small genetic alteration. It's less likely to have a significant impact on the protein's function, especially if the substituted amino acid has similar properties.
* Implications for evolutionary history: The fact that such a small difference exists between humans and gorillas implies that they shared a common ancestor relatively recently in evolutionary history. Over time, mutations accumulate, and the longer two species have been evolving independently, the more differences they will have in their DNA, including their protein sequences.
Therefore, the single amino acid difference in hemoglobin supports the idea that humans and gorillas share a recent common ancestor and are closely related species.
