| Measure | Value |
|---|
| Phenotype | Genotypes | Observed | Expected |
|---|
Simplifications: genes A and B are on different chromosomes and assort independently; recessive a and b alleles make no enzyme (or no inhibitor); one working copy is enough for each step (except in the additive model, where doses add); every zygote survives; each offspring is drawn by chance from the parents' gametes. The live identification compares the F2 counts with all seven ratios and picks the closest by chi-square (p = 0.05).
Simplifications: every mutant is recessive, true-breeding and white-flowered; each one knocks out one gene of the purple pigment pathway; there are no intragenic complementation effects or deletions. Real screens can include dominant mutations, which give white F1s with every partner and cannot be assigned by this test.
Problems are randomly generated. Probabilities can be typed as a fraction (3/16), a decimal (0.1875) or a percent (18.75%). Chi-square answers are accepted within about 0.05. Unless stated, genes assort independently, recessive alleles make no working product, and penetrance is complete.
Your job
Drag a card onto a box, or tap a card and then tap the box's name. Cards are buttons, so Tab and Enter work too.
Fictional people, animals and data, based on classic experiments. Teaching examples only, not medical advice or genetic counseling.
Wrong picks are fine here. Each one tells you why.