b) Homeotic genes code for transcription factors that control the development of segment-specific body parts.
c) Cells receive molecular signals that communicate their position in relation to other cells.
e) Positional information controls pattern formation.
f) Differential gene expression affects the developmental process in animals.
Pattern formation is the development of a multicellular organism's spatial organization, including the arrangement of tissues and organs. Cells receive molecular signals, collectively called positional information, that inform the cells about their location in relation to other cells and to the body axes. Positional information regulates pattern formation.
Homeotic genes are regulatory genes that work after the body axes have been established. Homeotic genes identify particular body segments in an individual, eventually leading to the formation of segment-specific body structures in the correct locations on the body.