Harriet B. Creighton and Barbara McClintock 1931. working with corn and Curtis Stern simultaneously proove that Crossing over it the reciprocal exchange of chromatids. It is clear from history that Creighton and McClintock were first but their proff was less well knownuntil B. McClintock won the McArthur and the Nobel Prize. We will consider the Creighton-McClintock paper rather than Stern to avoid too much Drosophila genetics. The key to the proof involves finding a double heteromorphic chromosome for study. In corn there was the case of chromosome-9 with a knob on one end and a translocated piece from another chromosome added to the end.

Results of Cross

Text iGenetics by Peter J. Russell

This web site is provided for instruction in Botany and Zoology 342

by Kenneth G. Wilson,
Professor of Botany
Miami University
wilsonkg@muohio.edu