twPa−1,twPa−2,twPa−3: three newt-haplotypes in the mouse

Abstract

TwPa−1 is a new lethal t-haplotype isolated in the South of France. Homozygous embryos die at the time of implantation or shortly there-after following general disorganization. twPa−1 complements all previously known t-haplotypes and has thus to be considered as the first representant of a new complementation group. twPa−2 and twPa−3 are viable, male sterile haplotypes, but twPa−2 is low transmitter.