A morphogen:
Is not expressed from a localised source in the embryo
Does not form a concentration gradient
Is not a signalling molecule
Specifies cell fates according to its concentration
Bicoid mRNA is tightly localised to the posterior end of the egg.
Which of the following is not an example of induction?
Xenopus animal cap assay
Homologous recombination
Anchor cell signalling to vulval precursors in the C.elegans embryo
In mosaic development, isolated cells are able to develop without external signalling.
Somites give rise to which of the following...? (Multiple answers)
Neural tube
Skeletal muscle
Notocord
Dermis
Glia
MyoD is sufficient to direct muscle development when transfected into non-muscle cells
Reverse genetics uses the mutant phenotype as a starting point
Which of the following are gain of function mutations...?
Amorph
Antimorph
Neomorph
Hypomorph
Hypermorph
Kit and Steel are in the same gene
Which of the following is the ligand-receptor pair Kit and Steel responsible for the normal development of...? (Multiple answers)
Melanoblasts
Keratinocytes
Germ cells
Fibrocytes
Megakaryocytes
Haematopoietic stem cells
Which one of the following is the correct Hh pathway sequence?
Hh ---| Ptc ---| Smo --> Ci ---> wg
Hh ---| Smo --> Ptc --> Ci ---| wg
wg ---> Ci ---> Ptc ---| Smo ---| Hh
wg ---| Smo ---| Ptc ---> Ci ---> Hh
Barchyury codes for a transcription factor responsible for the development of which germ layer?
Mesoderm
Ectoderm
Endoderm
