Update Bio Notes 1/26
Update Bio Notes 1/26 BIO 1144
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This 3 page Study Guide was uploaded by Rocket on Tuesday January 26, 2016. The Study Guide belongs to BIO 1144 at Mississippi State University taught by Thomas Holder in Spring 2016. Since its upload, it has received 60 views.
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Date Created: 01/26/16
Bio II Notes Thomas Holder 1/26 ❖ Class Mammalia approx. 8,000 species +Exhibit traits of a Reptilian Ancestor Most likely something with 4 legs (tetrapod) Most complex, highly specialized most advanced group +Size Range 1.5g Bat → 100,000 kg Whale +Mammals that are similarlylike Fishlike Birdlike Reptilelike (only 3 species of egg layers) +Diagnostic Traits Thick Integument Hair, both needed for insulation→ endothermic More sensory receptors in skin in mammals than other groups Mammary Glands secrete milk for young +Teeth Heterodont dentition condition of having different types of teeth, incisors/canines/premolars/molar Thecodont dentition condition where long rooted teeth are embedded in sockets of the jawbone Diphyodont dentition condition of having 2 sets of teeth in lifetime Dentary large single bone in lower jaw, broad side for tissue attachment +Biggest Enhancement Increased skull size and regions In humans: Brain : Spinal Chord ratio is 55:1 More complex and specialized +Ear Pinna: flap of cartilage/loose connective tissue to funnel sound waves to outer ear 3 small bones in middle Ear: Ossicles (incus, malleus, and stapes) +Reproduction Viviparous : greatest extent of live bearing than in any other groups All but 3 species have placenta connections from mother to young ★ Order Primates +Special Traits Grasping digits on all 4 limbs Flat faced, instead of muzzle Nails rather than claws Binocular Vision Sense of Vision outpaces Smell +Behaviors/Sensories Complex Learning Behaviors Well developed established learning patterns Enhanced sense of touch, especially hairs Enhanced parental investment of offspring Major increase of ratio of brain to body size Taxonomy of Man Kingdom Animalia Phylum Chordata Subphylum vertebrae Class mammalia Order primates Suborder Anthropoidea Superfamily Hominoidea Family Hominidae Subfamily Homininae Tribe Hominini Genus Homo Species Homo sapiens “wise humans” FIGURE 32.3 33.8 END OF MATERIAL FOR EXAM NUMBER 1
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