The karyotype of the Japanese mamushi, Agkistrodon blomhoffiiblomhoffii collected in Gifu-ken is investigated directly from the born marrow preparations. The chromosome number of males and females of this species is 2n=36, consisting of 8 macrochromosome pairs and 10 microchromosome pairs. The pair no. 4 is the sex chromosomes. In the male it is a metacentric homomorphic pair (ZZ), while in the female a metacentric and subtelocentric heteromorphic pair (ZW). The length of the W-chromosome is about two third of the Z-chromosome. Among 10 microchromosomes, the largest pair no. 9 is confirmed to be metacentric.
Variants of serum transferrin and red cell haemoglobin in two native sheep breeds (Awassi and Mor Karaman) and purebreed of Merinos and their several cross breed populations were studied by starch gel electrophoresis. The frequencies of transferrin and haemoglobin phenotypes and their alleles were researched. Although the phenotype of Hb-AA was very rare, all three haemoglobin types were clarified. Five transferrin alleles (TfA, TfB, TfM, TfD, TfE) were recognized in whole populations. Fourteen transferrin phenotypes consisting of four homozygotes and ten heterozygotes were recognized. Genotype and gene frequencies of each allele were demonstrated.
Polymorphism of life span were revealed in wild type fruit flies, D. melanogaster; several purebred strains possessing specific longevity patterns could be established by sib-mating through 13 to 20 generations from the same wild strains. Diverse sex differences were found among highly purebred strains. These results suggested the existence of major genes controlling life span on autosome(s) and on X chromosome in D. melanogaster. The penetrance of these genes is incomplete, probably affected by environmental factors.