STUDIES OF NATURAL POPULATIONS OF MUS. II. POLYMORPHISM AT THE T LOCUS.

摘要: Studies of a number natural populations the house mouse, Mus musculus, by Dunn and his collaborators (Dunn Morgan, 1953; Dunn, 1955; Suckling, 1956; Beasley, Tinker, 1960; Anderson, 1964) have revealed existence widespread polymorphism at T locus. This consists series alleles which are concerned with development axial structures in caudal region mouse. These alleles, t-alleles, divided into two major groups depending on their effect homozygous condition. Some when present condition (t/t) result prenatal mortality described as lethals. Other t-alleles cause only male sterility, all homozygotes being viable. In view selective disadvantage ubiquity is unexpected. The force keeping these an abnormal transmission ratio favors t-bearing sperm heterozygous (+/t) males (Dunn, 1957). Since locus examination was included this study to support conclusions about breeding structure reached from data other loci (Petras, 1965, 1967). process, information obtained about: (1) frequency wild populations, (2) fluctua-