According to the Gradualism Model

question 33

Multiple Choice

According to the gradualism model:

• A)the fossil record accurately reflects evolutionary history.
• B)the origin of genera requires mechanisms different from those involved in the origin of species.
• C)evolution occurs by the accumulation of many small changes in the frequencies of genes in a gene pool.
• D)species arise abruptly.
• E)new fossil forms appear rather suddenly in strata.

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Definitions:

Myelin

A fatty substance that surrounds the axon of some nerve cells, forming an insulating layer that is essential for the proper functioning of the nervous system, speeding up the transmission of nerve impulses.

Saltatory Conduction

A process whereby nerve impulses jump between gaps in the myelin sheath of neurons, speeding up signal transmission.

Nodes

Points of intersection or branching in a network or circuit, often used in the context of biological and technological systems.

Sodium Channels

Ion channels found in cell membranes that allow sodium ions to flow into or out of cells, playing a crucial role in generating and transmitting electrical signals.