Question

during the embryological development of a dog, a blastocyst forms in the first few days after fertilization. the blastocyst is a large group of stem cells that will eventually form the dog embryo. the diagram shows a blastocyst. how does the blastocyst eventually form all of the cells in the dogs body? proteins regulate gene expression in the stem cells of the blastocyst to form different specialized cells. each stem cell in the blastocyst contains only the genes needed to form the blastocyst. stem cells in the blastocyst lose the proteins they do not need in order to specialize. the stem cells in the blastocyst will combine genes to differentiate into specialized cells.

Explanation:

Proteins play a key - role in gene regulation. In the context of blastocyst development, proteins regulate gene expression in stem cells to form different specialized cells. Stem cells in a blastocyst have the potential to differentiate into various cell types. Each stem cell contains the full set of genes (not just those for the blastocyst), and they don't lose genes to specialize but rather regulate which genes are expressed. Combining genes is not how they differentiate; it's gene regulation.

Answer:

Proteins regulate gene expression in the stem cells of the blastocyst to form different specialized cells.