Abstract
Summary
In skeletal muscle of medaka, 3 distinctive patterns of LDH isozymes were found only in animals with YY sex chromo-somes. These patterns were characterized by additional isozymes quite different from the single pattern that characterized both XX and XY genotypes. It is suggested that the×chromosome may have one or more regulator genes for synthesis of subunits of LDH.
The interindividual variation of LDH zymograms in the YY genotype of medaka (Oryzias latipes) may be due to differences in genetic elements of individual Y chromosomes and seems to establish a third genetic function of Y chromosomes in medaka.
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