AP BIOLOGY

Detailed explanation-1: -Ancestral traits are more primitive features, such as teeth and tails, that do appear in ancestral forms. reduced forms of functional structures in other organisms. predicts that features of ancestors that no longer have a function for that species will become smaller over time until they are lost.

Detailed explanation-2: -an evolutionary trait that is homologous within groups of organisms (see homology) that are all descended from a common ancestor in which the trait first evolved.

Detailed explanation-3: -Primitive traits are those that a taxon has because it has inherited the trait from a distant ancestor. For example, all primates have body hair because we are mammals and all mammals share an ancestor hundreds of millions of years ago that had body hair.

Detailed explanation-4: -Homologous features If two or more species share a unique physical feature, such as a complex bone structure or a body plan, they may all have inherited this feature from a common ancestor. Physical features shared due to evolutionary history (a common ancestor) are said to be homologous.

Detailed explanation-5: -Organisms have only two types of traits: primitive and derived. Primitive traits are those inherited from distant ancestors. Derived traits are those that just appeared (by mutation) in the most recent ancestor–the one that gave rise to a newly formed branch.