A comparable genetic sequence in each alien has been identified in the genes tha

Question

A comparable genetic sequence in each alien has been identified in the genes that code for eye growth. This genetic sequence has allowed the aliens to be divided into six groups, with the single-tail, three-eye group split in half. The geneticists also studied several outgroup species (not shown) to compile a likely ancestral DNA sequence. From this information, they have constructed four possible phylogenetic trees.

site 1 2 3 4 5 6 7 8 9 ancestral T C A C T G C A T group 1 T C C C T G C A T group 2a T G A C T A C A T group 2b T G A G A G G G C group 3 T G A C A G C G C group 4 C G A C T G T G C group 5 C G A C T G T G C

Explanation / Answer

Phylogenetic Tree III

Based on this genetic evidence, we can hypothesize that group 2b diverged from group 2a at the same time that groups 3, 4, and 5 diverged from group 2a. Either the addition of a fourth eye came after this divergence, or group 2b lost its fourth eye sometime in this group

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