A study published in $2000$ sequenced part of the mitochondrial cytochrome b gene from $61$ brown bears from two sites in Alaska. One population of brown bears lives on the coastal mainland of$$ Alaska, while a separate population lives on the ABC islands in southeastern Alaska.

Mainland and ABC brown bears differ by $11$ fixed nucleotide substitutions in the cytochrome b gene. This suggests that the two brown bear populations represent genetically unique clades.

The researchers compared the cytochrome b sequences of the two clades of Alaskan brown bears to those of $55$ polar bears. The analysis showed that polar bears and ABC brown bears differ at only three nucleotides in this$$ gene, whereas polar bears and mainland brown bears had more differences.

Based on the results of the $2000$ study, how should the portion of the tree extending from branch point $7$ be$$ altered?