In a Young Fetus, the Head's Length Is About Equal

question 192

Multiple Choice

In a young fetus, the head's length is about equal to the rest of the body's length. This illustrates the

• A)plasticity principle.
• B)catch-up growth principle.
• C)proximodistal developmental trend.
• D)cephalocaudal developmental trend.

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Definitions:

Operon

A functioning unit of DNA containing a cluster of genes under the control of a single promoter, found in prokaryotes and some viruses.

Repressible Genes

Genes whose expression can be decreased or halted in response to specific stimuli or conditions, as part of cellular regulatory mechanisms.

Transcribed

The process in which a segment of DNA is copied into RNA by the enzyme RNA polymerase.

End Product

The final product resulting from a process, often after a series of intermediate stages or chemical reactions.