Marcus Morton Rhoades

Marcus Morton Rhoades (July 24, 1903 in Graham, Missouri – December 30, 1991) was an American cytogeneticist.


He earned a Bachelor of Science degree in 1927, a Master of Science degree in 1928 from the University of Michigan and a Ph.D. degree in 1932 from Cornell University where he was a trainee of Rollins A. Emerson alongside future Nobel Prize winners George Beadle and Barbara McClintock, and completed a thesis on the topic of cytoplasmic male sterility in maize.[1][2]


After completing his doctoral studies, Rhoades's career spanned numerous institutions, first working as an experimentalist in plant breeding at Cornell University from 1932 to 1935, a research geneticist with the USDA in Ames, Iowa and later Arlington, Virginia from 1935 to 1940, an associate professor and later full professor at Columbia University from 1940 to 1948, a professor at UIUC from 1948 to 1958, and finally at Indiana University from 1948 until reaching maximum retirement age in 1974.[3][2]

In 1946 he was elected to the National Academy of Sciences.[4]

Rhoades was active in the Genetics Society of America, serving as the editor of Genetics from 1940 to 1948, and later as the Vice President and then President of the GSA.[3]

His research on maize led to important discoveries for basic genetics and the applied science of plant breeding. He was one of the first cytogenecists to document the pre-meiotic pairing of homologous chromosomes in maize, otherwise referred to as somatic pairing (Singh, 2003), and the first to document an instance of meiotic drive, a Mendelian inheritance caused by preferential segregation of certain versions of homologous chromosomes during meiosis.[5] Rhoades also pioneered work in nuclear-cytoplasmic interactions, demonstrating that mutation of the nuclear gene iojap produced heritable mutations in the genome of chloroplasts which persisted after the nuclear mutation was segregated away.

In 1907, Herbert J. Webber started the Synapsis Club, a student/faculty organization at Cornell University. Prof. Rollins A. Emerson continued and encouraged his students to become members, including Rhoades.[6]

In the 1940s, Rhoades served as the doctoral advisor of geneticist Ruth Sager at Columbia University.[7]

The M. Rhoades Early-Career Award, awarded annually by the maize genetics community for significant contributions to genetics research in maize or related species, was named in honor of Rhoades.[8][9]



  1. ^ "Archived copy" (PDF). Archived from the original (PDF) on 2013-04-06. Retrieved 2017-03-25.{{cite web}}: CS1 maint: archived copy as title (link)
  2. ^ a b[bare URL PDF]
  3. ^ a b[bare URL PDF]
  4. ^ "M. Rhoades". Archived from the original on 2015-09-06.
  5. ^ Birchler, James A. (2016). "Marcus Rhoades on Preferential Segregation in Maize". Genetics. 203 (4): 1489–1490. doi:10.1534/genetics.116.193011. PMC 4981257. PMID 27516610.
  6. ^ Kass, Lee B.; Bonneuil, Christophe; Coe Jr., Edward H. (2005). "The Origins and Beginnings of the Maize Genetics Cooperation News Letter". Genetics. 169 (4): 1787–1797. doi:10.1093/genetics/169.4.1787. PMC 1449575. PMID 15879515. Retrieved 11 November 2015.
  7. ^ Ogilvie, Marilyn Bailey; Harvey, Joy Dorothy (2000). The biographical dictionary of women in science : pioneering lives from ancient times to the mid-20th century. New York: Routledge. ISBN 9780415920407. OCLC 40776839.
  8. ^ "Andrea Gallavotti Wins Early-Career Award for Research on Maize Genetics". 4 April 2019.
  9. ^ "Maize Genetics Cooperation - Awards".
  10. ^ "Gramene Newsletter".