In the Process of Pattern Formation in the Drosophila Embryo

question 118

Multiple Choice

In the process of pattern formation in the Drosophila embryo,

• A) the first steps are specified by Hox genes.
• B) mutations in pair rule genes result in embryos missing every other segment.
• C) mutations in gap genes result in the insertion of extra segments.
• D) segment polarity genes determine the dorsal-ventral axes of segments.
• E) all segments develop the same organs.

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Definitions:

Lubrication

The process or technique of reducing friction between surfaces in contact by introducing a lubricant, such as oil or grease.

Contact Lenses

Corrective, therapeutic, or cosmetic lenses placed on the cornea of the eye to correct vision or for aesthetic purposes.

Rigid Gas-permeable

A type of hard contact lens that allows gas exchange through the material, providing clear vision and comfort.

Soft Contact Lenses

Flexible lenses placed on the surface of the eye to correct vision, more comfortable than rigid lenses.