Tina Falls While Climbing a Tree and Lands on Her

question 26

Multiple Choice

Tina falls while climbing a tree and lands on her back.Her frightened parents take her to the emergency room,where she is examined.Her knee-jerk reflex is normal and she exhibits a plantar reflex (negative Babinski reflex) .These results suggest that Tina has

• A)injured one of her descending nerve tracts.
• B)injured one of her ascending nerve tracts.
• C)a spinal injury in the lumbar region.
• D)a spinal injury in the cervical region.
• E)suffered no damage to her spinal cord.

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Definitions:

Speciation

The evolutionary process by which populations evolve to become distinct species, typically as a result of genetic isolation and environmental pressures.

Palms

A diverse family of tropical plants known for their large, compound, evergreen leaves and found in warm climates around the world.

Allopolyploidy

Refers to polyploidy (more than two paired chromosomes) resulting from interspecific hybridization. If polyploidy arises within a species, it’s called autopolyploidy.

Chromosome Number

The total number of chromosomes present in the cell nucleus of an organism, which is characteristic of each species.