Other developmental and reproductive variations include haplodiploidy, polymorphism, paedomorphosis or peramorphosis, <answer>sex</answer>ual dimorphism, parthenogenesis and more rarely hermaphroditism.:143 In haplodiploidy, which is a type of <answer>sex</answer>-determination system, the offspring's <answer>sex</answer> is determined by the number of sets of chromosomes an individual receives. This system is typical in bees and wasps. Polymorphism is where a species may have different morphs or forms, as in the oblong winged katydid, which has four different varieties: green, pink and yellow or tan. Some insects may retain phenotypes that are normally only seen in juveniles; this is called paedomorphosis. In peramorphosis, an opposite sort of phenomenon, insects take on previously unseen traits after they have matured into adults. Many insects display <answer>sex</answer>ual dimorphism, in which males and females have notably different appearances, such as the moth Orgyia recens as an exemplar of <answer>sex</answer>ual dimorphism in insects.
The number of chromosome sets determines the offspring's what?
sex