For example, although different species have dissimilar limbs, such as legs, flippers, or wings, their development is controlled by very similar genes, with the differences due to the way their expression is regulated.
Evo–devoderived from evolutionary developmental biology and incorporates the idea that regulatory genes, highly conserved across species, can influence embryonic development through varying the timing and expression of other genes. For example, although different species have dissimilar limbs, such as legs, flippers, or wings, their development is controlled by very similar genes, with the differences due to the way their expression is regulated.