Which of the Following Statements Is Always TRUE About Sister

question 42

Multiple Choice

Which of the following statements is always TRUE about sister taxa on a phylogenetic tree?

• A)Sister taxa are always the result of speciation events that result in two new genera.
• B)Sister taxa always share a most recent common ancestor that is not shared with any other taxon on the phylogeny.
• C)Sister taxa are always the result of the most recent divergence event represented on a phylogeny.
• D)Sister taxa are always defined by shared ancestral characteristics that have been modified in all other taxa in the phylogeny.

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Definitions:

Systematic Desensitization

A behavioral therapy technique used to reduce phobic reactions and anxieties by gradually exposing the individual to the feared object or situation.

Token Economy

A system of behavior modification based on the systematic reinforcement of target behavior through the exchange of tokens that can be redeemed for various rewards.

Participant Modeling

A therapeutic technique wherein a therapist first demonstrates a desired behavior in a step-by-step process, then the client attempts to imitate the behavior with guidance.

Antipsychotic Drugs

Drugs used to control severe psychotic symptoms, such as delusions, hallucinations, disorganized speech, and disorganized behavior, by inhibiting dopamine activity; also known as neuroleptics.