ANTH 1301 Lecture 7: Lecture 7
19 Oct 2015
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A derived trait (dt) is defined by a trait that is present in an organism, but was absent in the last common ancestor of the group being considered. An ancestral trait (at) is defined by a trait shared by a group of organisms as a result of descent from a common ancestor. *primates are defined mostly by following characteristics (although these traits are more expressed in some than others. Generalized teeth = teeth that are not adapted for mastication any one specific food. Lack of reliance on olfactory senses reliance on vision! Primates are equipped with color, 3-d (stereoscopic) vision. The eyes are positioned in the front of the head, which provides an overlapping in visual fields (binocular vision). * please note that nocturnal primates lack color vision. *please note that new world primates do not have a full range of color vision (males often having a color blindness to blue or green light = dichromacy).
