Post-zygotic Mechanism

Post-zygotic Mechanism i. Hybrid inviability – In this type, the sperm enters the egg, fertilization occurs and the embryo develops into the adult but it dies before reaching maturity. In certain fishes, fire and buried their dead. They did not practice agriculture and animal domestication. Cro-Magnon was one of the most talked forms of modern human found from the rocks of Cro-Magnon, France and is considered as the ancestor of modern Europeans. They were not only adapted to various environmental conditions, but were also known for their cave paintings, figures on floors and walls. Homo sapiens or modern human arose in Africa some , years ago and moved to other continents and developed into distinct races. They had a brain capacity of – cc. They started cultivating crops and domesticating animals.