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Unit 5 crosses and exceptions, from your own notes
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Meiosis is the randomness supply
Meiosis halves the chromosome set and shuffles it twice: crossing over in prophase I trades segments between homologues, and metaphase I orients each pair independently. Those two shuffles are why offspring vary, and free response answers that name the mechanism, not just the variation, earn the point.
Mendel's laws are probability rules, so treat crosses as arithmetic
Mendel's segregation puts one allele per gamete; independent assortment multiplies the odds across genes. A dihybrid heterozygote cross expects 9 3 3 1, and the fast method is multiplication, not a sixteen box grid: the chance of an aabb offspring is one quarter times one quarter. The exam rewards students who compute rather than draw.
Linkage breaks the second law, and the breakage is a ruler
Genes on one chromosome travel together, so a testcross of linked genes overproduces parental combinations. The recombinants that do appear come from crossing over, and their frequency scales with distance: linkage data turns wrong ratios into a map. When a question's numbers refuse 9 3 3 1, compute parental against recombinant before anything else.
Sex linkage and the other exceptions have signatures
X linked recessives surface in males, who have no second X to mask them, and pedigrees show affected sons of carrier mothers. Multiple alleles put more than two options in the population, blood type the standard case; incomplete dominance blends, codominance shows both; polygenic traits sum many genes into a bell curve. Each exception has a signature ratio or pedigree shape, and diagnosis is the tested skill.
Chromosomal errors change the count
Nondisjunction, a pair failing to separate in either meiotic division, leaves gametes with an extra or missing chromosome, and fertilisation turns that into aneuploidy. Environment then has its say on expression: phenotype reads genotype in context, temperature sensitive coat colour the classic case. State both layers and scenario questions resolve.
What to photograph for Heredity
Your crosses, pedigrees and ratio tables. Related: Unit 4, photo to quiz and pricing.
Sources used on this page
- College Board, AP Biology
- Meiosis
- Gregor Mendel
- Genetic linkage
- Nondisjunction
- Active recall
- Spaced repetition
- Testing effect
- Forgetting curve
- Generation effect
- Judgment of learning
- Metacognition
- Desirable difficulty
- Distributed practice
- Formative assessment
- Flashcard
- Cloze test
- Multiple choice
- Test (assessment)
- Educational assessment
- Advanced Placement
- Curriculum
- Study skills
- Study guide
- Note-taking
- Overlearning
- Instructional scaffolding
- Item analysis
- Mastery learning
| Pattern | The signature | How to diagnose |
|---|---|---|
| Mendelian dihybrid | 9 3 3 1 from het x het | Multiply single gene odds |
| Linked genes | Parental excess in testcross | Recombinant fraction is distance |
| X linked recessive | Affected males predominate | Carrier mothers, affected sons |
| Codominance | Both phenotypes visible | Blood type AB the model |
| Polygenic | Continuous bell curve | Many genes, small effects |
| Nondisjunction | Extra or missing chromosome | Trace the failed division |
What does AP Biology Unit 5 cover?
Heredity: meiosis, Mendel's laws as probability, non Mendelian patterns including linkage and sex linkage, chromosomal inheritance and its errors.
Do I have to draw Punnett squares?
They work, but multiplication is faster and scales: compute each gene's probability separately and multiply across genes for multi gene questions.
How do I spot linked genes?
A testcross overproduces parental combinations. The recombinant fraction estimates distance between the genes on the chromosome.
Why do X linked traits show in males more?
Males carry one X, so a single recessive allele is expressed; females need two copies and more often carry silently.
What does nondisjunction produce?
Gametes with an extra or missing chromosome; after fertilisation, aneuploidy. Questions ask which division failed, so trace both cases.
Can I build questions from my own Unit 5 notes?
Yes. The questions follow the upload: photograph these pages or attach the PDF, and nothing outside them enters the set.
Last updated: 2026-08-15