Reproductive isolation from a cross between a horse and a donkey or between a mare and a donkey, respectively. These animals are nearly always sterile due to the difference in the number of chromosomes between the two parent species. Both horses and donkeys belong to the genus "Equus", but "Equus caballus" has 64 chromosomes, while "Equus asinus" only has 62. A cross will produce offspring (mule or hinny) with 63 chromosomes, that will not form pairs, which means that they do not divide in a balanced manner during meiosis. In the wild, the horses and donkeys ignore each other and do not
Gloeoporus africanus (allantoid), measuring 3.8–4.2 by 0.6–0.7 μm. Gloeoporus africanus Gloeoporus africanus is a species of crust fungus in the family Irpicaceae. Found in Africa, it was described as a new species in 2018 by Paul Jung and Young Wood Lim. The type collection was made in Bwindi Impenetrable National Park, Uganda, where it was found growing on a fallen branch. It is somewhat similar in appearance to "Bjerkandera adusta", but is distinguished from that fungus by its angular pores and the white edges of the actively growing pore surface. "G. africanus" has a monomitic hyphal system, and its generative hyphae have