Allopatric Speciation Occurs When

question 49

Multiple Choice

Allopatric speciation occurs when

• A) gene flow is maintained between two subgroups of a mother population.
• B) two morphologically different subgroups of a species share the same habitat.
• C) gene flow prevents genetic variants from being exchanged between subgroups.
• D) a subgroup is physically isolated from the mother population and gene flow can no longer occur.

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Definitions:

Transport Pump

Proteins in cell membranes that use energy to move substances across the membrane, often against a concentration gradient.

Saltatory Conduction

The transmission of a neural impulse along a myelinated neuron; ion activity at one node depolarizes the next node along the axon.

Voltage-Activated

Pertains to ion channels in cell membranes that open or close in response to changes in membrane potential.

Action Potential

A rapid rise and subsequent fall in voltage or membrane potential across a cellular membrane, due to the movement of ions in and out of the neuron.