midterm_2011KEY - NAME: _KEY_LAB DAY:_ pg 1 BIOLOGY OF...

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NAME: __________KEY_____________LAB DAY:________ pg 1 BIOLOGY OF FISHES (EEMB 106) MIDTERM – 2011 – PLEASE PLACE YOUR NAME AND LAB DAY ON ALL SHEETS 1) Briefly define 8 (eight only) of the following terms (2 points each) - We will only grade the first 8 answers. Cladogram A graphical depiction of the evolutionary relationships among a group, constructed from a series of characters with the aim of minimizing the number of transitions from one character state to another. This produces the simplest arrangement, and suggests the course of evolution and the characteristics of common ancestors. Squalene An oily substance with low density (less than water) stored in the liver of sharks and rays; used to convey buoyancy. Ganoid A type of scale found in chondrostean fishes: large, thick, has a heavy layer of ganoin on the surface. Ostracoderm The first fishes: an ancient, extinct group with heavy armor and no jaws. Branchiostegal rays A series of small bony rays supporting the gill membranes behind the lower jaw in advanced fishes, aids in respiratory movements. A distinguishing characteristic of the ray-finned fishes (Actinopterygii). Flexion The bending-up of the caudal end of the notochord that occurs about mid-way in fish larval development. Diphycercal tail: A tail in which the vertebral column extends caudally beyond the lobes of the caudal fin. Found in modern fishes in the coelacanth and the Australian lungfish. Physostomous: A term describing the condition of the swimbladder in which there is a direct connection to the esophagus. Ovoviviparous: Refers to a condition in which the young are retained inside the mother, but receive no nutrition other than that provided by the yolk. Homocercal tail: A fish tail where the upper and lower lobes are symmetrical. Generally found in more advanced fishes. Protogyny: Sequentially hermaphroditic sex change from female to male
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NAME: __________KEY_____________LAB DAY:________ pg 2 2) Indicate whether the following statements are true or false (1 point each ): __F____ Because smells are airborne, fish lack olfactory receptors __F____
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This note was uploaded on 01/10/2012 for the course EEMB 106 taught by Professor Staff during the Spring '08 term at UCSB.

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midterm_2011KEY - NAME: _KEY_LAB DAY:_ pg 1 BIOLOGY OF...

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