Question

Suppose that in the evolutionary history of these organisms, the mark "c" indicates the appearance of and strong selection for the trait "extra hairy legs." Is it possible that leaf-cutter bees have perfectly smooth legs, with no hair at all, when all of the other lineages descended from ancestral population "c" do have hair? If so, explain how that could have evolved. If not, explain why not.

Answer 1

Yes, it is possible that a member of the "c" descendant has no hair. it is generally called loos of character.

It is a phenomena that have also appeared in snakes that descend from a leged ancestor, the leafcutter bees at some point of their history developed a mutation that strips them of their hair, this mutation for environmental reasons was either an adaptative trait or a nonadaptive trait that did not affect the survival of the leafcutter bee, leading to the establishment of the mutation and trait in the specie and the divergence in the lineage