Mikhail Navashin
Videos
Mikhail Sergeevich Navashin was a Soviet cytologist and cytogeneticist known for his work on plant chromosomes and chromosome evolution. He was among the first researchers to demonstrate chromosomal t
Navashin's grave at Peredelkino Cemetery in Moscow
Barbara McClintock
Videos
Barbara McClintock was an American scientist and cytogeneticist who was awarded the 1983 Nobel Prize in Physiology or Medicine. McClintock received her PhD in botany from Cornell University in 1927. T
Mikhail Navashin
…Crepis. Ring chromosomes were subsequently described in animals by Lilian Vaughan Morgan in Drosophila melanogaster and analyzed in detail in maize by Barbara McClintock in the early 1930s. Navashin was born in Kyiv in 1896, the son of the botanist Sergei Navashin. In 1918 he graduated from the agronomy faculty of the…
McClintock in her laboratory, 1947
McClintock children, from left to right: Mignon, Malcolm Rider "Tom", Barbara and Marjorie
McClintock family, from left to right: Mignon, Tom, Barbara, Marjorie and Sara (at the piano)
The relationship of Ac/Ds in the control of the elements and mosaic color of maize. The seed in 10 is colorless; there is no Ac element present, and Ds inhibits the synthesis of colored pigments called anthocyanins. In 11 to 13, one copy of Ac is present; Ds can move, and some anthocyanin is produced, creating a mosaic pattern. In the kernel in panel 14 there are two Ac elements, and in panel 15 there are three.