Evolutionary pressure across male mammals to guarantee the procreation of their own offspring led to a rapid evolution of the testicle. Bioinformatic studies—conducted by an international team of researchers led by Prof. Dr. Henrik Kaessmann from the Center for Molecular Biology of Heidelberg University—show that this pressure particularly accelerated the evolution of later stages of sperm formation.
Click here for original story, Tracing the rapid evolution of spermatogenesis across mammals
Source: Phys.org