Variations in Gene Expression That Occur Without Alterations in DNA

question 185

Multiple Choice

Variations in gene expression that occur without alterations in DNA sequence are called _____ modifications

• A)epigenetic
• B)nutrigenomic
• C)nutrigenetic
• D)biogenetic

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Definitions:

Mesoderm

The intermediate layer in an embryo during its initial stages of development, responsible for forming the muscular, skeletal, and circulatory systems.

Somites

Blocks of mesoderm that are located on either side of the spine in the developing embryo, which will differentiate into the vertebrae, ribs, muscles, and dermis.

Mesonephros

One of three excretory organs appearing during embryonic development; forms caudal to the pronephros as the pronephros disappears. It is well developed and is functional for a time before the establishment of the metanephros, which gives rise to the kidney. It undergoes regression as an excretory organ, but its duct system is retained in the male as the efferent ductule and epididymis.

Mandibular Processes

Portions of the mandible or lower jawbone involved in the formation of the chin and sides of the lower jaw.