Inheritance foundations: the assumptions of a simple model
In brief
Begin with the illustrative cross Aa × Aa. Assume a single diploid locus, equal transmission probabilities for A and a from each parent, independent combination of gametes and no selection changing the proportions between the stated stages. A table gives expected genotypes. Translating them into phenotypes requires an additional dominance assumption.
Evidence for this statement
EcoGenesis
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Build the Aa × Aa table under the stated assumptions. AA, Aa, aA and aa each have probability 1/4; grouping the two heterozygous outcomes gives 1:2:1. Only with the additional assumption of complete A dominance do expected phenotype proportions become 3:1. Label these as teaching-model probabilities, not measurements or a prediction for a small family or complex trait. Save the assumptions and explain how changing them can change the expectation.
Evidence for this statement
EcoGenesis
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Self-assessment criterion
Genotype and phenotype are distinct; model assumptions are recorded; 3:1 is used only under complete dominance.
Evidence for this statement
EcoGenesis
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Open the original lecture: А. И. Ким · Генетика- 06:19 · Наследственность
- 07:50 · Изменчивость
- 01:15:08 · Законы Менделя
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Editorial draft · human review pending
- А. И. Ким · Генетика
2026-09-19T10:16:32.816827+00:00 · Terms of use on source site
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- The official page and chapter labels were checked. Video language: Russian. Full viewing, exact seek and embedding permission are unverified. Open the original and select the listed chapter.
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