Abstract

(…) Makino (1948) studied chromosomes of a male P. dalli using traditional sectioning of testis tissue. Since it was generally accepted in those days that the two color morphs represent separate species (Kuroda, 1954; Houck, 1976), his study was possibly based on the present “dalli-type” individuals. The present paper is a preliminary report of a study conducted to further investigate the chromosomal differences between the two color types of the Dall’s porpoise. (…)