Slide showing three sets of diagrams showing 'independent inheritance of two pairs of characters in drosophila'. Slide shows three sets of diagrams showing 'independent inheritance of two pairs of characters in drosophila'. Sets of diagrams are labelled from top to bottom: P1, F1 and F2. P1 and F1 have two sets of flies each, and F2 has a total of sixteen flies. Title below image reads: 'Fig 27 - the independent inheritance of two pairs of characters in drosophila. A pure long-winged fly with ebony body mated with a vestigial-winged grey -bodied one produces all long-winged, grey-bodied flies in F1. These when inbred produce an F2 generation consisting of 9/16 long-grey; 3/16 long-ebony; 3/16 vestigial-grey and 1/16 vestigial ebony. (From Morgan, Sturtevant, Muller and Bridges, courtesy Henry Holt and co.)' Late 19th to early 20th century