Biology B.S. - Ecology and Organismal Biology
The Ecology and Organismal Biology concentration is for students interested in the biology of organisms (plants or animals) or the biology of populations or communities. Course offerings include those from organismal biology, ecology, evolutionary biology, and conservation biology. This concentration is a graduate preperatory program and it is designed for students interested in academia or employment with government or environmental consulting agencies. This concentration is also an excellent choice for pre-veterinary students.
General Degree Requirements
To earn a baccalaureate degree, all students must complete successfully, in addition to any other requirements, the University of Montana General Education Requirements. Please refer to the General Education Requirements page for more information.
Additional requirements for graduation can be found on the Degree/Certificate Requirements for Graduation page.
Unless otherwise noted in individual program requirements, a minimum grade point average of 2.00 in all work attempted at the University of Montana-Missoula is required for graduation. Please see the Academic Policies and Procedures page for information on how your GPA is calculated.
Courses taken to satisfy the requirements of a major, minor, or certificate program must be completed with a grade of C- or better unless a higher grade is noted in the program requirements.
Bachelor of Science - Biology; Ecology and Organismal Biology Concentration
Course Requirements
| Code | Title | Hours |
|---|---|---|
| Biology/Microbiology Lower-Division Core | ||
| Complete all of the following courses: | ||
| BIOB 160 | Principles of Living Systems | 3 |
| BIOB 161N | Principles of Living Systems Lab | 1 |
| BIOB 170N | Principles of Biological Diversity | 3 |
| BIOB 171N | Principles of Biological Diversity Lab | 2 |
| BIOB 260 | Cellular and Molecular Biology | 4 |
| BIOB 272 | Genetics and Evolution | 4 |
| Upper-Division Core Courses Required by Ecology & Organismal Biology Concentration | ||
| Complete one of the following courses: | 5 | |
| General Ecology and General Ecology Lab (equivalent to 271) | ||
| Field Ecology | ||
| Additional Upper-Division Courses Required for the Ecology & Organismal Biology Concentration | ||
| Complete a minimum of 21 credits of upper-division BIOB, BIOE, BIOH, BIOL, BIOM, BIOO, or BCH course, with at least one course from each of the following subcategories. Other recommended courses include BCH 380 or BCH 480-BCH 482. 21 total credits required. | 21 | |
Organismal Course Requirement | ||
Complete at least one organismal course (lab must also be taken, if available) from the following list: | ||
| Developmental Biology | ||
| General Genetics | ||
| Comparative Animal Physiology | ||
| Endocrinology | ||
| Comparative Vertebrate Anatomy | ||
| Plant Physiology and Plant Physiology Lab | ||
-Ology Course Requirement | ||
Complete at least one course with a focus on a group of organisms (lab must also be taken, if available) from the following list: | ||
| General Microbiology and General Microbiology Lab | ||
| General Parasitology and General Parasitology Lab | ||
| General Botany | ||
| Rocky Mountain Flora | ||
| Biology and Management of Fishes | ||
| Entomology | ||
| Ornithology | ||
| Mammalogy | ||
Specialized Ecology Course Requirement | ||
Complete one of the following courses: | ||
| Aquatic Microbial Ecology (Flathead Lake Biological Station - summer only) | ||
| Alpine Ecology (Flathead Lake Biological Station - summer only) | ||
| Freshwater Ecology | ||
| Stream Ecology (Flathead Lake Biological Station - summer only) | ||
| Conservation Biology (Flathead Lake Biological Station - summer only) | ||
| Ecosystem Ecology | ||
| Terrestrial Plant Ecology | ||
| Landscape Ecology (Flathead Lake Biological Station - summer only) | ||
| Lake Ecology (Flathead Lake Biological Station - summer only) | ||
| Forest and Fire Ecology (Flathead Lake Biological Station - summer only) | ||
| Microbial Diversity Ecology & Evolution | ||
| Ecology of Infectious Diseases | ||
| Wildlife Physiological Ecology | ||
| Conservation of Wildlife Populations | ||
Evolution Course Requirement | ||
Complete one of the following courses: | ||
| Conservation Genetics | ||
| Phylogenics and Evolution | ||
| Genomics | ||
| Behavior & Evolution | ||
| Plant Evolution | ||
| Host-Microbe Interactions | ||
| Mathematics - Calculus 2 | ||
| Complete one of the following courses: | 4 | |
| Applied Calculus | ||
| Calculus I | ||
| Mathematics - Statistics 3 | ||
| Complete either one semester or a full year of statistics from the following: | 4-8 | |
One Semester: | ||
| Introduction to Statistics | ||
Full Year: | ||
| Statistical Methods I and Statistical Methods II | ||
| Computer Data Analysis I and Computer Data Analysis II | ||
| Chemistry 4 | ||
| Complete one of the following sequences of general and organic chemistry: | 10-20 | |
Introductory Chemistry (10 credits): | ||
| Introduction to General Chemistry | ||
| Introduction to Organic and Biochemistry and Introduction to Organic and Biochemistry Lab | ||
Advanced Chemistry (20 credits): | ||
| College Chemistry I and College Chemistry I Lab | ||
| College Chemistry II and College Chemistry II Lab | ||
| Organic Chemistry I and Organic Chemistry I Lab | ||
| Organic Chemistry II and Organic Chemistry II Lab | ||
| Physics | ||
| Complete one of the following Physics sequences: | 10 | |
Algebra- and Trigonometry-based Physics: | ||
| College Physics I and College Physics I Laboratory | ||
| College Physics II and College Physics II Laboratory | ||
Calculus-based Physics: | ||
| Fundamentals of Physics with Calculus I and Physics Laboratory I with Calculus | ||
| Fundamentals of Physics with Calculus II and Physics Laboratory II with Calculus | ||
| Writing in the Disciplines Requirement | ||
| To complete the Writing in the Disciplines Requirement, Biology students take 2 or 3 partial writing courses (either three 1/3 writing courses or one 1/3 writing course and one 2/3 writing course) or one complete writing course. | 3-9 | |
| Total Hours | 74-94 | |
- 1
The lower-division core should be completed before attempting most upper-division major courses. AP Biology credit with a score of 3 may be substituted for either BIOB 160/BIOB 161N or BIOB 170N/BIOB 171N.
- 2
Students should choose M 171 if they plan to take additional calculus courses if they plan to double major or minor in a field that requires more calculus (e.g. astronomy, math, physics, biochemistry, computer science).
- 3
Students should choose the full year of statistics for graduate preparation in ecology.
- 4
Students who begin in the advanced chemistry sequence may substitute those courses for introductory sequence courses at the discretion of the major advisor. Students should choose the advanced sequence for graduate preparation in organismal biology or pre-veterinary medicine.
Writing in the Disciplines Distributed Model Courses for Biological Sciences
| Code | Title | Hours |
|---|---|---|
| 1/3 Writing in the Disciplines Courses | ||
| BCH 482 | Advanced Biochemistry II | 3 |
| BIOB 410 | Immunology | 3 |
| BIOB 425 | Advanced Cellular & Molecular Biology | 3 |
| BIOB 483 | Phylogenics and Evolution | 3 |
| BIOE 371 | General Ecology Lab (equivalent to 271) | 2 |
| BIOE 403 | Comparative Vertebrate Anatomy | 4 |
| BIOE 428 | Freshwater Ecology | 5 |
| BIOH 447 | Genes and Development Lab | 3 |
| BIOM 327 | Vector-Borne Diseases: Public Health Perspectives | 3 |
| BIOM 435 | Virology | 3 |
| BIOO 470 | Ornithology | 4 |
| BIOO 475 | Mammalogy | 4 |
| WILD 470 | Conservation of Wildlife Populations | 4 |
| 2/3 Writing in the Disciplines Courses | ||
| BCH 486 | Biochemistry Research Lab | 3 |
| BCH 499 | Senior Thesis/Capstone | 3-6 |
| BIOB 411 | Immunology Laboratory | 2 |
| BIOB 499 | Undergraduate Thesis | 3-6 |
| BIOE 448 | Terrestrial Plant Ecology | 4 |
| BIOE 485 | Plant Evolution | 3 |
| BIOM 499 | Undergraduate Thesis | 3-6 |
| Full Writing in the Disciplines Courses | ||
| BIOH 462 | Principles of Medical Physiology | 3 |
| BIOM 420 | Host-Microbe Interactions | 3 |
Track 1: Introductory Chemistry (ecology/field biology)
| Freshman | ||
|---|---|---|
| Autumn | Hours | |
| BIOB 160 & BIOB 161N |
Principles of Living Systems and Principles of Living Systems Lab |
4 |
| BIOB 194 | Your Future in Biology | 1 |
| CHMY 121N | Introduction to General Chemistry | 4 |
| M 171 or M 162 |
Calculus I or Applied Calculus |
4 |
| WRIT 101 | College Writing I | 4 |
| Hours | 17 | |
| Spring | ||
| BIOB 170N & BIOB 171N |
Principles of Biological Diversity and Principles of Biological Diversity Lab |
5 |
| CHMY 123 & CHMY 124 |
Introduction to Organic and Biochemistry and Introduction to Organic and Biochemistry Lab |
6 |
| General Education Requirement | 3 | |
| Hours | 14 | |
| Sophomore | ||
| Autumn | ||
| BIOB 260 | Cellular and Molecular Biology | 4 |
| General Education Requirement | 3 | |
| Intermediate Writing Course | 3 | |
| Elective | 5 | |
| Hours | 15 | |
| Spring | ||
| BIOB 272 | Genetics and Evolution | 4 |
| STAT 216 | Introduction to Statistics | 4 |
| General Education Requirement | 3 | |
| Elective | 4 | |
| Hours | 15 | |
| Junior | ||
| Autumn | ||
| BIOE 370 & BIOE 371 |
General Ecology and General Ecology Lab (equivalent to 271) |
5 |
| PHSX 205N & PHSX 206N |
College Physics I and College Physics I Laboratory |
5 |
| General Education Requirement | 3 | |
| Upper Division Elective | 3 | |
| Hours | 16 | |
| Spring | ||
| BIOB 480 |
Conservation Genetics (Evolution Elective) or Phylogenetics and Evolution or Genomics or Behavior & Evolution or Plant Evolution or Host-Microbe Interactions |
3 |
| BIOE 428 |
Freshwater Ecology (Specialized Ecology Elective) 1 or Ecosystem Ecology or Terrestrial Plant Ecology or Microbial Diversity Ecology & Evolution or Ecology of Infectious Diseases or Wildlife Physiological Ecology or Conservation of Wildlife Populations |
3-5 |
| PHSX 207N & PHSX 208N |
College Physics II and College Physics II Laboratory |
5 |
| General Education Requirement | 3 | |
| Hours | 14-16 | |
| Senior | ||
| Autumn | ||
| Major Elective (BIO_ 300+) | 4 | |
| Major Elective (BIO_ 300+) - Advanced Writing | 4 | |
| Upper Division Elective | 6 | |
| Elective | 1 | |
| Hours | 15 | |
| Spring | ||
| BIOB 301 |
Developmental Biology (Organismal Elective) or General Genetics or Comparative Animal Physiology or Endocrinology or Comparative Vertebrate Anatomy or Plant Physiology and Plant Physiology Lab |
3 |
| BIOO 320 |
General Botany (-Ology Elective) or Rocky Mountain Flora or Biology and Management of Fishes or Entomology or Ornithology or Mammalogy or General Microbiology and General Microbiology Lab or General Parasitology and General Parasitology Lab |
4-5 |
| General Education Requirement | 3 | |
| Upper Division Elective | 4 | |
| Elective | 1 | |
| Hours | 15-16 | |
| Total Hours | 121-124 | |
Last updated Autumn 2025
Track 2: Advanced Chemistry (pre-vet/organismal biology)
| Freshman | ||
|---|---|---|
| Autumn | Hours | |
| BIOB 160 & BIOB 161N |
Principles of Living Systems and Principles of Living Systems Lab |
4 |
| CHMY 141N & CHMY 142N |
College Chemistry I and College Chemistry I Lab |
5 |
| M 171 or M 162 |
Calculus I or Applied Calculus |
4 |
| BIOB 194 | Your Future in Biology | 1 |
| Hours | 14 | |
| Spring | ||
| BIOB 170N & BIOB 171N |
Principles of Biological Diversity and Principles of Biological Diversity Lab |
5 |
| CHMY 143N & CHMY 144N |
College Chemistry II and College Chemistry II Lab |
5 |
| General Education Requirement | 3 | |
| WRIT 101 | College Writing I | 4 |
| Hours | 17 | |
| Sophomore | ||
| Autumn | ||
| BIOB 260 | Cellular and Molecular Biology | 4 |
| STAT 216 | Introduction to Statistics | 4 |
| CHMY 221 & CHMY 222 |
Organic Chemistry I and Organic Chemistry I Lab |
5 |
| Intermediate Writing Course | 3 | |
| Hours | 16 | |
| Spring | ||
| CHMY 223 & CHMY 224 |
Organic Chemistry II and Organic Chemistry II Lab |
5 |
| BIOB 272 | Genetics and Evolution | 4 |
| General Education Requirement | 6 | |
| Hours | 15 | |
| Junior | ||
| Autumn | ||
| BIOE 370 & BIOE 371 |
General Ecology and General Ecology Lab (equivalent to 271) |
5 |
| BIOO 320 |
General Botany (-Ology Elective) or Rocky Mountain Flora or Biology and Management of Fishes or Entomology or Ornithology or Mammalogy or General Microbiology and General Microbiology Lab or General Parasitology and General Parasitology Lab |
5 |
| PHSX 205N & PHSX 206N |
College Physics I and College Physics I Laboratory |
5 |
| Hours | 15 | |
| Spring | ||
| BIOB 301 |
Developmental Biology (Organismal Elective) or General Genetics or Comparative Animal Physiology or Endocrinology or Comparative Vertebrate Anatomy or Plant Physiology and Plant Physiology Lab |
3 |
| PHSX 207N & PHSX 208N |
College Physics II and College Physics II Laboratory |
5 |
| General Education Requirement | 3 | |
| Upper Division Elective | 3 | |
| Elective | 1 | |
| Hours | 15 | |
| Senior | ||
| Autumn | ||
| BIOE 428 |
Freshwater Ecology (Specialized Ecology Elective) 1 or Ecosystem Ecology or Terrestrial Plant Ecology or Microbial Diversity Ecology & Evolution or Ecology of Infectious Diseases or Wildlife Physiological Ecology or Conservation of Wildlife Populations |
4-5 |
| Major Elective (BIO_300+) | 3 | |
| General Education Requirement | 3 | |
| Upper Division Elective | 4 | |
| Hours | 14-15 | |
| Spring | ||
| Major Elective (BIO_300+) - Advanced Writing | 3 | |
| BIOB 480 |
Conservation Genetics (Evolution Elective) or Phylogenetics and Evolution or Genomics or Behavior & Evolution or Plant Evolution or Host-Microbe Interactions |
3 |
| General Education Requirement | 3 | |
| Upper Division Elective | 6 | |
| Hours | 15 | |
| Total Hours | 121-122 | |
Last updated Autumn 2025