302 / FIELDS OF INSTRUCTION
malacology, mammalogy, marine biology, ornithology, parasitology, general or com-
parative physiology, protozoology, vertebrate paleozoology, animal behavior, and
zoogeography. May be repeated only with special permission. May not be taken
by students on academic probation.
ZY 632-ADVANCED INVERTEBRATE ZOOLOGY 4 credits
 Prerequisite: ZY 308. Morphology, physiology, development, and life cycles
 of selected invertebrate groups, with emphasis on the minor phyla.
 ZY 633-PRINCIPLES OF SYSTEMATIC ZOOLOGY. 3 credits
 Selected taxonomic synopses, revisions, and monographs; distribution, genetics,
 and ecology of taxonomic problems.
 ZY 642-PHYSIOLOGICAL ECOLOGY. 5 credits
 Prerequisites: ZY 570, ZY 571. Physiological mechanisms that influence distribu-
 tion and ecological relations, water conservation, and energy exchange in vertebrates.
 ZY 647-EXPERIMENTAL EMBRYOLOGY. 3 credits
 Prerequisites: ZY 310, ZY 570, ZY 571. Problems of embryonic development
 and the experimental approach to their solution.
 ZY 648-EXPERIMENTAL EMBRYOLOGY LABORATORY. 2 credits
 Prerequisite or corequisite: ZY 647. Modern techniques for the analysis of
 embryonic development in a wide variety of zoological material.
 ZY 651--ICHTHYOLOGY. 5 credits
 Prerequisite: ZY 306.
ZY 652-HERPETOLOGY. 5 credits
 Prerequisite: ZY 306.
ZY 653-MAMMALOGY. 5 credits
 Prerequisite: ZY 306.
ZY 654-ORNITHOLOGY. 4 credits
 Prerequisite: ZY 306.
ZY 664-TOPICS IN GENETICS. 2 to 4 credits
 Identical with AL 664, AY 664, BCY 664, BTY 696, PY 664. See AY 664.
 May be repeated with change of content up to a maximum of 12 credits.
 ZY 665-ECOLOGICAL GENETICS. 5 credits
 Prerequisites: ZY 325, ZY 505, STA 520. Mutation, migration, selection, density,
 subdivision, behavior, and maintenance of variability as they affect the genetic
 structure of natural populations.
 ZY 667-THEORETICAL POPULATION ECOLOGY. 5 credits
 Prerequisites: ZY 325 or AY 362 and AY 363; ZY 505 or BTY 501; STA 520.
Analysis of mechanisms controlling distribution and density of animal populations
in terms of quantitative data and models.
ZY 668-FIELD POPULATION ECOLOGY. 5 credits
 Prerequisites: ZY 325; ZY 505 or BTY 501. Interaction of population structure,
genetic properties, and ecological factors in controlling the dynamics and evolu-
tionary character of natural populations.
ZY 671-ETHOLOGY. 4 credits
 Prerequisite: ZY 505. History, concepts, and methods of the comparative study
of animal and human behavior. The biological substrate and classification of be-
havior.
ZY 673-SEMINAR IN ANIMAL BEHAVIOR. 3 credits
 Prerequisite: ZY 671. Special behavioral topics. May be repeated with change
of content up to a maximum of 9 credits.