Safety, privacy and evidence boundary
Use fictional organisms, coins/cards, and published-style datasets. Do not require personal family histories, ancestry testing, fertility information, medical pedigrees, or personal genetic data. Trait inheritance never ranks human worth.
Explicit science instruction
Mendelian models describe inheritance at loci where allele transmission can be approximated by segregation of homologous chromosomes. A diploid individual carries two allele copies at a locus; meiosis separates homologues so a gamete ordinarily receives one.
Dominance describes phenotype expression in a specified heterozygote; it does not mean an allele is stronger, more common, better, or more likely to be inherited. Genotype names allele combinations; phenotype describes measured outcomes.
Vocabulary: locus; allele; homozygous; heterozygous; genotype; phenotype; dominance; segregation.
Worked example with reasoning
A fictional Aa individual produces gametes carrying A or a. Under a simple segregation model and equal gamete viability, each has probability 1/2. Crossing Aa × Aa gives AA, Aa, Aa, aa as equally likely genotype cells in a Punnett representation, yielding expected genotype probabilities 1/4, 1/2, 1/4.
Guided question
Why does segregation arise from chromosome behavior rather than from alleles “choosing” where to go?
Independent work
- Model an Aa parent through meiosis.
- State gamete probabilities.
- Distinguish genotype from phenotype.
- Explain what dominance does—and does not—mean.
Misconception check
Dominant does not mean common, healthy, evolutionarily superior, or guaranteed to appear in every child.
Formative understanding check
What probability does an Aa parent contribute allele a under the simple model?
Worked response
1/2, assuming ordinary segregation and no transmission distortion.
Open-book formative practice only; not an official mastery attempt or grade.
Mentor evidence conference
Ask Archaemenes to challenge your probability, evidence classification, model assumptions, and limitations. The mentor does not infer personal genetics or provide protected assessment answers.
Open ArchaemenesTeacher guidance
Foundation: use allele cards matched to homologues. Core: connect meiosis to segregation and probabilities. Extended: add transmission distortion or viability as explicit model-breaking cases.
Preserve learning evidence
Keep models, calculations, corrections, and limitations in the matching Week 20 evidence field.
Return to evidence workspace