Homeotic Genes Activate Genes That Determine the Morphological Characteristics of Each

question 13

Multiple Choice

Homeotic genes activate genes that determine the morphological characteristics of each segment.

• A) Segment
• B) Parasegment
• C) Realizator
• D) Zygotic

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Definitions:

Gastrulation

A phase early in the embryonic development of most animals, during which the single-layered blastula is reorganized into a multilayered structure known as the gastrula.

Germ Layers

The three primary layers of cells (ectoderm, mesoderm, and endoderm) in the early embryo that give rise to all organs and tissues in the body.

Embryonic Disk

Point in the inner cell mass at which the embryo begins to be formed.

Ectoderm

Outermost of the three germ layers of an embryo.