A specific dye is used to stain the cells located on the surface of a blastula at the animal pole. During gastrulation, these cells remain on the exterior and spread out to cover the embryo. Which tissue type will these stained cells most likely contribute to in the adult?

Question

A specific dye is used to stain the cells located on the surface of a blastula at the animal pole. During gastrulation, these cells remain on the exterior and spread out to cover the embryo. Which tissue type will these stained cells most likely contribute to in the adult?

BlackTom AI · Accepted Answer

First, restating the scenario helps frame the question: a dye stains cells on the surface of a blastula at the animal pole, and during gastrulation these cells stay on the exterior and spread to cover the embryo. The query asks which adult tissue these stained cells will most likely contribute to.
Option 1: The skeletal muscles and skeleton (Mesoderm). This choice assigns mesodermal fate to cells initially on the outer surface that expand to cover the embryo. While some exterior cells can contribute to mesoderm, the described movement and exterior position during gastrulation more specifically aligns with ectodermal derivatives rather than skeletal tissues, so this is unlikely to be correct as the primary outcome here.
Option 2: The notochord. The notochord originates from mesoderm (specifically axial mesoderm) and forms along the midline during gastrulation. Since the stained cells are described as remaining on the exterior and spreading to cover the embryo rather than delaminating to form axial mesoderm, this option does not fit the given scenario.
Option 3: The lining of the digestive tract (Endoderm). Endoderm forms from cells that migrate inward during gastrulation to create the gut lining, not from exterior surface cells that stay on the exterior and spread over the embryo. The described behavior contradicts endoderm formation, making this option inaccurate for the given cells.
Option 4: The central nervous system and skin (Ectoderm). The ectoderm originates from cells on the animal pole that remain on the surface during gastrulation and subsequently spread to cover the embryo, giving rise to external structures like the epidermis (skin) and internal neural tissues that form the central nervous system. This pattern matches the described staining and cell movements most closely, supporting ectodermal derivatives as the adult outcome.
In summary, evaluating the developmental origins: mesoderm and endoderm arise from inward-mating movements and internal layers, whereas ectoderm forms from exterior cells that persist on the surface during gastrulation and later generate skin and neural tissues. Given the observed behavior of the stained cells, option 4 is the best fit.

Bio 93 Section CDE 2025 Final- Section E

A specific dye is used to stain the cells located on the surface of a blastula at the animal pole. During gastrulation, these cells remain on the exterior and spread out to cover the embryo. Which tissue type will these stained cells most likely contribute to in the adult?

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