SEX-DIFFERENCES IN POLYMORPHISM AND EXPRESSION OF AAT-1 IN THE HIROSHIMA POPULATION OF BUERGERIA-BUERGERI (ANURA, RHACOPHORIDAE)

Buergeria buergeri is female heterozygous in sex determination; chromo some pair No. 7 in this species is a pair of sex chromosomes of the ZZ /ZW type. Genetic analysis of AAT-1 variants was carried out to elucid ate the mode of inheritance of this locus by starch-gel electrophoresi s using field-caught females and males and their offspring produced by artificial crossings. The results showed that the AAT-I locus is sex- linked and that alleles are expressed on the Z chromosome, but not the W chromosome. It is evident that the AAT-1 gene of female offspring i s hemizygous and that the allele present is on the Z chromosome, which is derived from the male parent.