Evo-devo:

Part of biology dealing with ow genes give instructions to different parts of our bodies

This explains how sometimes evolution can take place quicker than thought possible

Developmental regulatory genes:

Activate genes that put the body parts together. {They do not instruct on how to do, just when to}
These start working early in embryonic development.
Gap genes are what tells the blastula to start invaginating

Under the first tier of regulatory genes, there are more tiers of regulatory genes which give more precise information on what to do

It is likely that a lot of the non-coding DNA maybe regulatory genes.

For really early stages of development, the proteins that are produced by some regulatory genes(gene products) are present in the unfertilised egg

Regulatory genes are inherited similarly to other genes but have no alleles, so every member of a species has the same DNA sequence in those genes

Homeobox genes(Hox genes):

Type of regulatory gene that acts when the embryo is more developed.
They setup how the body is organised/specify regions of the body

The highest tier regulatory genes are similar across different animals groups like in all mammals or even all vertebrates, differences are in the lower tier regulatory genes