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B chromosomes do not contain 4th chromosome genes. (A) Schematic of the 4th chromosome showing the distribution of the seven genes that were assayed by genetic approaches (Rsp3A, ci, and ey) or qPCR (ci, Crk, Asator, mav, and Caps). (B) qPCR analysis showing approximately equal relative quantities of the gene products tested in the wild-type and WT+B stocks. The 2nd chromosome gene ord and the X chromosome gene y were used as controls.
