Your Professor Wants You to Construct a Phylogenetic Tree of Orchids

question 24

Multiple Choice

Your professor wants you to construct a phylogenetic tree of orchids. She gives you tissue from seven orchid species and one lily. What is the most likely reason she gave you the lily?

• A) to serve as an outgroup
• B) to see if the lily is a cryptic orchid species
• C) to see if the lily and the orchids show all the same shared derived characters
• D) to demonstrate likely homoplasies

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Definitions:

Stimulus

Any event or situation that evokes a response from an organism.

Pressure Wave

A type of wave propagated through fluids or gases where the wave fronts consist of regions of high and low pressure.

Binocular Cues

Visual information taken in by two eyes that enable us a sense of depth perception, or the ability to perceive the three-dimensional structure and distance of objects.

Monocular Cues

Visual information that allows for perception of depth and distance using one eye, including texture gradient, interposition, and linear perspective.