A Genetic Change That Caused a Certain Hox Gene to Be

question 3

Multiple Choice

A genetic change that caused a certain Hox gene to be expressed along the tip of a vertebrate limb bud instead of farther back helped to make possible the evolution of the tetrapod limb. This type of change is illustrative of

• A)the influence of environment on development.
• B)paedomorphosis.
• C)a change in a developmental gene or in its regulation that altered the spatial organization of body parts.
• D)heterochrony.
• E)gene duplication.

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Definitions:

ERG Theory

A motivation theory developed by Clayton Alderfer that categorizes human needs into three groups: Existence, Relatedness, and Growth.

Physiological Well-Being

A state of physical health and functioning that allows an individual to perform daily activities without limitations or distress.

Maslow's Hierarchy

A theory of psychological motivation based on a hierarchy of needs, from basic survival needs to self-actualization.

Lower-Order Physiological Needs

Basic human necessities such as food, water, shelter, and sleep that are essential for survival.