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 togetherThey 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