Slide showing nine diagrams demonstrating the 'End of pachytene and metaphase configurations of a pair of chromosomes differing in respect of a single inversion.' Slide shows nine diagrams demonstrating the 'End of pachytene and metaphase configurations of a pair of chromosomes differing in respect of a single inversion.' Each diagram is labelled with a letter or letter combination. They are as follows: 'S', 'R', 'C', 'D', 'S+d', 'S+pR', 'S+pC', 'S+pD' and 'C+pD'. Title below images reads: 'Figs 90 and 91. - End of pachytene and metaphase configurations of a pair of chromosomes differing in respect of a single inversion. S, single crossing-over in the inversion.; R, reciprocal; C, complimentary and, D, disparate crossing-over in the inversion. d and p, crossing-over distal and proximal to the inversion. One chromosome broken, the other entire, except for breaks at point of inversion.' Late 19th to early 20th century