Mutations Like Bithorax,in Which a Second Pair of Wings Develops

question 23

Essay

Mutations like bithorax,in which a second pair of wings develops in the place of halteres,give clues to the evolutionary origin of differentiated structures.What inferences might you draw from bithorax,or antennapedia?

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Definitions:

Sensory Neurons

These are nerve cells that are responsible for converting external stimuli from the environment into internal electrical impulses.

Peripheral Nervous System

The part of the nervous system that consists of the nerves and ganglia outside of the brain and spinal cord, connecting the CNS to limbs and organs.

Synaptic Gaps

The tiny spaces between neurons, across which neurotransmitters travel to transmit signals from one neuron to another.

Interneurons

Neurons that transmit impulses between other neurons, especially as part of reflex arcs and neural circuits.