chapter  10
8 Pages

Cortical Morphogenesis

Tracy Sonneborn started his career in biology studying the flatworm, Stenostomum.1 He found that when he treated the worms with lead acetate he was able to induce individuals with two heads, rather than the normal one. This trait proved to be stable at reproduction. Although he suspected that the trait was inherited cytoplasmically, he was unable to determine decisively, for no sexual reproduction was available.