Sperm motility kinase Tcr mutant form (Smoktcr)

While the main function of Smoks is to control sperm motility, the function of Smok-Tcr, with reduced kinase activity, is to counterbalance a signaling handicap caused by the distorter/sterility loci, giving t-sperm an edge in reaching the oocytes. Transmission ratio distortion also called segregation distortion is the name given to the phenomenon above-mentioned.

Being connected with the T-complex, it allows males heterozygous for a complete t-haplotype to preferentially transmit the t- haplotype chromosome. .