In the 1890s Correns examined the hereditary effects of pollen on developing embryos by cross breeding varieties of peas and maize. Correns's research also included a study of plant cell wall growth, as well as floral morphology, the physiology of climbing plants and plant sensitivity, leaf primordia, and moss and liverwort vegetative reproduction. Correns's research denied the idea that pollen grain size variations were adaptations to flower styles, and he further challenged Darwin regarding his conclusions on the effect of increasing temperature on the sensitivity of leaves. His research focused on heterostylism, in an attempt to counter and critique Charles Darwin's (1809-1882) views on adaptations to outbreeding. Working with Nageli during his early career, Correns was at least partially restricted to investigations that sought to extend the work of his mentor Nageli. He served as a lecturer, then assistant professor, at the University of Leipzig, became full professor at Munster, and finally in 1913 was appointed the first director of the Kaiser-Wilhelm Institute of Biology in Berlin. He married Karl von Nageli's (1817-1891) niece Elizabeth Widmer in 1892. An only child who was orphaned at age 17, Correns contracted a case of tuberculosis that delayed the degree he finally received from the University of Munich in 1889. Correns's research was the first to correlate Mendelian segregation with the reduction division of chromosomes, and he illustrated several important examples of deviations in Mendelian inheritance, such as natural variations in the dominant-recessive heredity pattern.Ĭorrens was born in Munich to a Swiss mother and German father who was a member of the Bavarian Academy of Art. Correns investigated and confirmed the validity of many Mendelian laws and showed a deep understanding of Mendelian genetics. Carl Correns was one of three scientists who simultaneously rediscovered the work of Gregor Mendel (1822-1884).
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