The occurrence of cases in which the heterozygote is intermediate (the absence of dominance) was added in a footnote to his 1900 paper. That dominance was not always present had been seen and understood by Mendel, according to his letters to Nägeli. By a quirk of history Correns was a student of Nägeli, a renowned botanist with whom Mendel corresponded about his work with peas. Nägeli failed to understand how significant Mendel's work was.
Correns produced the first evidence of cytoplasmic inheritance, in his 1909 paper on variegated leaf colour in Mirabilis jalapa. The basis of this inheritance is that chloroplasts, the organelles which conduct photosynthesis, are inherited solely from the maternal parent.
- Correns C. 1900. G. Mendels Regel über das Verhalten der Nachkommenschaft der Rassenbastarde. Ber. deutsch. botan. Zeit. 60, II, 5/6:65–82
- Sturtevant A.H. 1965. A history of genetics. Harper & Row N.Y. p31
- Correns C. Vererbungsversuche mit blass (gelb) grünen und buntblättrigen Sippen bei Mirabilis, Urtica, und Lunaria. Zeits. ind. Abst. Vererb. 1:291–329
- Hagemann, R (2000). "Erwin Baur or Carl Correns: who really created the theory of plastid inheritance?". J. Hered. 91 (6): 435–40. doi:10.1093/jhered/91.6.435. PMID 11218080. Unknown parameter
- Saha, M S (November 1981). "The Carl Correns papers". The Mendel newsletter; archival resources for the history of genetics & allied sciences. 21: 1–6. PMID 11615874. Unknown parameter