The Himalayan Allele in Rabbits Produces Dark Fur at the Extremities

question 22

Multiple Choice

The himalayan allele in rabbits produces dark fur at the extremities of the body-on the nose, ears, and feet. The dark pigment develops, however, only when a rabbit is reared at a temperature of 25°C or lower; if a Himalayan rabbit is reared at 30°C, no dark patches develop. What does this exemplify?

• A) dominance
• B) discontinuous characteristic
• C) genetic imprinting
• D) phenocopy
• E) temperature-sensitive allele

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Definitions:

Sacral Portions

Relating to the sacrum, a triangular bone at the base of the spine composed of five fused vertebrae, part of the pelvis.

Law of Bell and Magendie

A fundamental principle in neuroscience stating that anterior spinal roots contain only motor fibres and posterior roots contain only sensory fibres.

Dorsal Spinal Cord

The portion of the spinal cord oriented towards the back of the body, containing sensory neural pathways that convey information from the body to the brain.

Ventral Spinal Cord

The front portion of the spinal cord involved in transmitting sensory information to the brain and motor control signals away from the brain.