The Birth Defect Spina Bifida Results in Part of the Spinal

question 18

Multiple Choice

The birth defect spina bifida results in part of the spinal cord lying outside of the body. This defect is due to abnormal development of the:

• A)neural tube.
• B)gill grooves.
• C)allantois.
• D)placenta.
• E)embryonic disc.

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Definitions:

Venom Genes

Genetic sequences that code for the production of venom, a toxic substance used by some animals for defense or to capture prey.

Defensin Gene

A gene that codes for defensins, which are small cysteine-rich cationic proteins involved in the innate immune response.

Gene Recruitment

Gene recruitment refers to the co-option of a particular gene or network for a totally different function as a result of a mutation. The reorganization of a preexisting regulatory network can be a major evolutionary event.

C-Opsins

A class of light-sensitive proteins found in the photoreceptor cells of the retina, involved in the visual systems of various organisms.