Molecular Biology

Basically, the DNA sequences called homeoboxes help homeotic genes in animals direct development. These genes are significant because they have been relatively well-conserved during evolution

Related sequences are present in the genes of plants and yeasts. Other developmental genes also are highly conserved among animal species, but they
may play different roles in the development of different species. During embryonic development in both plants and animals, a cascade of transcription regulators turns genes on or off in a carefully regulated sequence. However, the genes that direct analogous developmental processes differ consid-
erably in sequence in plants and animals as a result of their remote ancestry.