Genetics at Western Governors University (WGU) is an introductory course for undergraduates seeking licensure or endorsement in secondary or middle grade science. It covers heredity, molecular genetics, gene regulation and variation.
The course mixes problem-solving with explanation. You predict outcomes with Mendelian and non-Mendelian rules, then connect them to molecules and to modern technologies. Students struggle most when a question changes the inheritance pattern without saying so.
Course at a Glance
| Item | Details |
|---|---|
| University | Western Governors University (WGU) |
| Course code | D879 |
| Level | Undergraduate, secondary science teacher preparation |
| Size | 3 competency units in the BS Science Education (Secondary Biological Science) guide |
| Subject area | Heredity and molecular genetics |
| Typical work | Genetic crosses, explanations of inheritance, applications of biotechnology |
What D879 Covers
| Competency (WGU wording, summarized) | What it means in practice |
|---|---|
| Apply Mendelian and non-Mendelian principles to predict genetic outcomes | Punnett squares, probability, incomplete dominance, codominance, sex linkage |
| Describe relevant genetic techniques and technologies and their link to emerging biotechnical applications | What tools such as PCR or gene editing do, and where they are used |
| Describe the molecular structures and processes of inheritance and sources of variation | DNA, chromosomes, mutation and recombination |
Key Concepts Explained
Mendelian Crosses
A monohybrid cross between two heterozygotes (Aa x Aa) gives a 1 AA : 2 Aa : 1 aa genotype ratio and a 3 : 1 phenotype ratio under complete dominance. Always define your symbols first.
Non-Mendelian Patterns
In incomplete dominance the heterozygote is intermediate; in codominance both alleles show fully. Sex-linked traits follow the X chromosome, so males are affected more often for recessive X-linked conditions.
Example: Crossing a red and a white snapdragon (incomplete dominance) gives all pink offspring. Crossing two pink plants gives 1 red : 2 pink : 1 white. A 1 : 2 : 1 phenotype ratio is the clue that dominance is incomplete rather than complete.
Example: A carrier mother (XHXh) and an unaffected father (XHY) have a 50 percent chance of each son being affected and no affected daughters, though half the daughters are carriers. Always give the probability for sons and daughters separately.
Sources of Variation
Variation arises from mutation, crossing over, independent assortment and random fertilization. Linking each source to a stage in meiosis helps answers feel structured.
Typical Assignments and How to Approach Them
| Task type | What it tests | How to approach it |
|---|---|---|
| Cross and probability problem | Predicting outcomes accurately | Define alleles, show the square, state genotype and phenotype ratios |
| Pedigree analysis | Deducing inheritance pattern | Test dominant, recessive and X-linked options and rule out the rest |
| Technology explanation | Understanding applications | Say what the technique does, one use and one ethical consideration |
| Variation explanation | Molecular and meiotic origins | Link each source of variation to a process |
A Problem-Solving Routine
Genetics rewards a repeatable routine more than last-minute cramming. Use the same steps on every problem so errors become easy to spot.
| Step | Action | Why it helps |
|---|---|---|
| 1 | Define alleles and symbols | Stops genotype and phenotype being mixed up |
| 2 | Decide the inheritance pattern from the clues | Ratios and sex differences reveal the model |
| 3 | Set up the square or probability rule | Shows working a reader can follow |
| 4 | State the answer in words | Meets the explanation part of the rubric |
A Worked Dihybrid Example
Dihybrid crosses look intimidating, but they follow from two single-trait crosses multiplied together. Treat each gene separately, then combine the probabilities, instead of drawing a sixteen-box square for every problem.
Example: Two pea plants are both heterozygous for seed shape (Rr, round dominant) and seed color (Yy, yellow dominant). The chance of a round seed is 3/4 and of a yellow seed is 3/4, so the chance of round and yellow is 3/4 x 3/4 = 9/16. Round and green is 3/4 x 1/4 = 3/16, wrinkled and yellow is 3/16, and wrinkled and green is 1/16. The classic 9 : 3 : 3 : 1 ratio appears.
This method only works when the genes assort independently. If a question gives linked genes or tells you the offspring ratios differ from 9 : 3 : 3 : 1, say so and explain what that suggests about gene location.
Where Students Get Stuck
- Assuming dominance. Check the ratios before choosing a model.
- Missing sex linkage. If the numbers differ between sexes, consider the X chromosome.
- Mixing up genotype and phenotype. Label each answer clearly.
- Mathematical slips. For independent traits, multiply probabilities and show the working.
Study Tips for D879
- Practice a cross a day until each pattern is automatic.
- Draw three pedigrees (autosomal dominant, recessive, X-linked recessive) and note the telltale features.
- Keep a short glossary of techniques with one real use each.
- Explain the answer in a sentence after the working, not only the ratio.
How We Help with D879
Send the problem set or prompt, the rubric and your attempt if you have one. A genetics-literate writer prepares a custom worked solution or checks your reasoning step by step.
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Frequently Asked Questions
WGU lists Mendelian and non-Mendelian inheritance, gene regulation, individual variation and modern genetic technologies.
Three: applying Mendelian and non-Mendelian principles, describing genetic techniques and technologies, and describing the molecular basis of inheritance and variation.
It includes calculation, but also explanation and application, so both skills are needed.
Genetics focuses on inheritance patterns and variation. Molecular Biology goes deeper into replication, transcription, translation and metabolic pathways.
Test each possible inheritance pattern against the pedigree and eliminate those that break a rule.
Yes. Send the problem and your working and we explain any errors.