A third sex-linked lethal factor in Drosophila

✍ Scribed by Morgan, T. H.

• Publisher: John Wiley and Sons
• Year: 1914
• Tongue: English
• Weight: 332 KB
• Volume: 17
• Category: Article
• ISSN: 0022-104X
• DOI: 10.1002/jez.1400170302

✦ Synopsis

In an experiment (reported in the Jour. Exp. Zool., page 390, November, 1911) in which three sex-linked characters were involved, namely, white eyes, vermilion eyes and miniature wings, certain results were obtained involving double crossing-over. The more recent results indicate that double crossing-over was excessive in this experiment.l A white miniature male had been mated to a vermilion pink ('orange') female. The daughters were wild type (red, long) and the sons vermilion (long). The two sexchromosomes of these daughters contain respectively the genes for white (w), red (V), and miniature (m); and for red (W), and vermilion (v), and long (M). All later work has shown the order of the genes here involved is white, vermilion, miniature, as shown in diagram 1.

On this basis, the results of the previous experiment in terms of cross-overs would be as follows:

Total

Per cent Non-cross-overs (vermilion and ver. pink males) 333 74.7 Single cross-overs between white and vermilion