Homeobox genes, including Hox genes, code for highly conserved transcription factors that act as master regulators of embryonic development. Describe the general roles of homeobox genes in animal development, and suggest the specific roles of these genes in the patterning and development of vertebrate limbs (including digits).
30 exam-style questions on OCR A A Level Biology Cellular control. Each one has a worked solution and a mark scheme showing where the marks go.