What affects the size and shape of bird beaks?

Where would you expect TGFB-3 to be expressed in the chicken embryo facial region?

Cleft palate can be caused by either genetic or environmental factors.

The image below is a ventral view of the craniofacial region in a human embryo.

What does X point to?

Cranial neural crest cells are pre-patterned before they migrate.

DLX genes regulate the anterior-posterior patterning of the branchial arches

A zebrafish embryo has as loss-of-function mutation in genes early in the Hoxa and Hoxd series  (Hox1-4). What would be the result in the developing craniofacial area?

Treacher-Collins

syndrome features hypoplasia of facial bones

A mouse embryo has a loss-of-function mutant in Sox10, which has impeded proper cranial neural crest migration. What would be the most likely result?