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
Africanus Fabius Maximus Africanus' brother, Paullus Fabius Maximus and his wife, Marcia. Africanus Fabius Maximus Africanus Fabius Maximus was the younger son of Quintus Fabius Maximus (consul 45 BCE). Although commonly referred to as Africanus Fabius Maximus, it remains unclear whether that was his official name or whether it was Quintus Fabius Maximus Africanus. His elder brother was Paullus Fabius Maximus (consul 11 BCE) and his sister was Fabia Paullina, who married Marcus Titius. It is believed that Africanus was named in honour of his famous family ancestor Publius Cornelius Scipio Africanus Aemilianus. The career of Africanus Fabius Maximus is much less clear