Slide showing a diagram demonstrating 'method for the detection of induced translocation'. Slide shows a diagram demonstrating 'method for the detection of induced translocation'. Title below image reads: 'Fig 113 - Method for the detection of induced translocation. At upper left, normal female with genes a and b in different chromosomes. When crossed with Aa Bb male containing translocation between these chromosomes (due to previous treatment with X-rays), two of the four expected classes (Ab and aB) die, so that there appears to be complete linkage between A and B. (From Dobzhansky, 1936.)' Late 19th to early 20th century