| Measure | Value |
|---|
| Phenotype class | Expected fraction | Observed | Expected |
|---|
Simplifications: all four genes assort independently (no linkage), dominance is complete, every zygote survives, and each offspring is drawn by chance from the parents' gametes. Gene A is flower colour (purple or white), B is seed colour (yellow or green), C is seed shape (round or wrinkled) and D is plant height (tall or short). Class labels list the phenotype for each gene: A_ means AA or Aa. The test uses α = 0.05 and is unreliable if any expected count is below 5.
Problems are randomly generated. Type probabilities as a fraction (3/64), a decimal (0.0469) or a percent (4.69%); give decimals to at least 3 significant figures. Counts are whole numbers. Chi-square values are accepted within about 0.05. Genes assort independently, dominance is complete, pedigrees assume full penetrance and no new mutations, and affected people with a rare dominant condition are heterozygous.
Your job
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