The Dlx/Hox Gene Control System Operates Across Many Phyla, Which

question 24

Multiple Choice

The Dlx/Hox gene control system operates across many phyla, which is strong evidence that it evolved a very long time ago.Which of the following is true concerning this relationship?

• A)Hox activates Dlx.
• B)Dlx came first due to multilimbed animals in the fossil record.
• C)Hox came first due to legless animals in the fossil record.
• D)It randomly affects the number of limbs within insects.
• E)None of these are true.

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Definitions:

Intramembranous Ossification

A process where bone tissue is created directly on or within fibrous membranes, playing a vital role in the development of flat bones like the skull.

Osteoprogenitor Cells

Osteoprogenitor cells are stem cells found in bone marrow that have the potential to differentiate into osteoblasts, which are responsible for new bone formation.

Trabeculae

Mesh-like structures of bone or tissue that provide structural support and help in reducing weight in living organisms.

Ossification Centers

Locations in the fetus where bone formation begins during the process of ossification, leading to the development of the skeletal system.