Ordovician - Primitive plants and fungi colonize land, first jawless vertebrates,  Mass extinction at end of period

TLS Online TPP Program

#Id: 4774

#Unit 5. Developmental Biology

At the 4-cell stage, the EMS cell requires a signal from its neighbor (and sister cell), the P2 blastomere.

TLS Online TPP Program

#Id: 7420

#Unit 5. Developmental Biology

one of Antennapedia’s functions is to repress the genes that would trigger antenna and eye development.

TLS Online TPP Program

#Id: 9153

#Unit 11. Evolution and Behavior

TLS Online TPP Program

#Id: 4787

#Unit 5. Developmental Biology

The GLP-1 protein (a Notch homologue) which is present on both the ABa and ABp cells

TLS Online TPP Program

#Id: 6328

#Unit 8. Inheritance Biology

XX-XO SEX DETERMINATION

The mechanism of sex determination in the grasshoppers studied by McClung