In a Very Large Population, a Quantitative Trait Has the Following

question 34

Multiple Choice

In a very large population, a quantitative trait has the following distribution pattern. If there is no gene flow, the curve shifts to the left or to the right, and the population size consequently increases over successive generations, which of the following is most likely occurring?

• A) immigration or emigration
• B) directional selection
• C) disruptive selection
• D) genetic drift

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Definitions:

Cerebellum

A major structure of the hindbrain that controls fine motor skills, balance, coordination, and posture.

Ulnar Grasp

A type of grasp reflex seen in infants, involving the fingers closing tightly around an object placed in the hand, named after the ulna bone due to its involvement in the movement.

Pincer Grasp

The coordination of the index finger and thumb to grasp small objects, a significant milestone in infant motor skill development.

Canalization

The genetic and environmental process by which the development of an organism is directed toward a predetermined phenotype, regardless of minor environmental or genetic variations.