Further Studies on the Genetics and Cytology of Drosophila ananassae

Abstract

1. Revised chromosome maps of the X-chromosome of D. ananassae are published (Fig. 1).
2. By using two kinds of inversions which are present in the X-chromosome, it has been concluded that a part of the X-chromosome is homologous to a part of the fourth chromosome.
3. From the data on the X-chromosome of D. ananassae, it is as-sumed that high temperature does not affect on the frequency of crossing-over in a heterochromatic portion.
4. The CIIL-O Inversion shown in my previous paper belongs to the racial inversion distributed commonly in wild populations.
5. Some apparently male intersexes due to gene action were described.