In Studies of Gene Expression,which Observation Would Be the Least

question 22

Multiple Choice

In studies of gene expression,which observation would be the least likely?

• A) As the result of radically different developmental processes within an insect species,some members of the species have a pair of wings that its conspecifics lack.
• B) Expression of a gene that is important in developmental processes varies with temperature.
• C) A species of fish is much larger than fish in a closely related species because a gene affecting bone growth is expressed earlier in development in the larger fish than in the related species.
• D) The amino acid sequence of a Hox gene protein is extremely similar in nematodes and humans.
• E) One rodent species has a narrower face than all others,because in that species the expression pattern of a gene that is important in development is more restricted in its spatial effects.

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Definitions:

Radula

A unique anatomical feature found in mollusks, consisting of a chitinous ribbon-like structure used for feeding by scraping or cutting food.

Polychaetes

A class of annelid worms, known for their bristled segments which are predominantly marine.

Chaetae

Bristle-like structures made of chitin found on the bodies of annelid worms, such as earthworms, contributing to their locomotion.

Oligochaetes

A group of segmented worms, including earthworms, characterized by having a relatively small number of chaetae (bristles) compared to other polychaetes.