T or F a)Quadrula and Radiatula each have glochidia that are unhooked – this must be a result of convergent evolution (e.g. homoplasy). b)The common ancestor of Parreysiinae mussels definitely had 'Unhooked' glochidia. c)Note that Mytilus, Mercenaria, and Neotrigonia are mussels that do not have glochidia larvae - they still have larvae, but they are distinct from the other taxa in this tree. Given this, it is unlikely that the common ancestor of all mussel taxa represented in this tree had glochidia larvae.

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Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.