Where in an embryo are the instructions located for how to build organs

It's cell differentiation signals produced by nucleus of cells. In an embryo, there are unspecialized pluripotent embryonic stem cells that rely on cell signals to differentiate into organs, even before the embryo is formed, in the blastocyst stage, there are 2 layers of cells, the inner cell mass is destined to form internal organs, and the outer ball of cells forms skin cells, intestines etc

All the instructions are encoded in the DNA within the nucleus. We don't fully understand how the zygote, with the same genetic material as our adult cells, instructs the newly developing embryo to form tissues and organs, but it is all in the DNA.

The main role of dna in the  cell is the long-term storage of information. it is often compared to a blueprint, since it contains the instructions to construct other components of the  cell, such as  proteins  and rna molecules.the main function of rna is to carry information of amino acid sequence from the genes to where  proteins  are assembled on  ribosomes  in the  cytoplasm. mark brainliest, my work is good.