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Does the test cross fit 1:1:1:1?
Topic: Mendelian genetics
In pea plants, round seeds (R) are dominant to wrinkled (r) and yellow seeds (Y) are dominant to green (y). A student crossed a plant heterozygous for both genes (RrYy) with a wrinkled green plant (rryy) and scored 400 seeds from the cross. Her hypothesis is that the two genes assort independently.
Data
| Seed phenotype | Observed |
|---|---|
| Round yellow | 114 |
| Round green | 86 |
| Wrinkled yellow | 92 |
| Wrinkled green | 108 |
Calculate χ² = Σ (O − E)² / E for the independent-assortment hypothesis and choose the correct conclusion. Critical χ² values at p = 0.05: df 1 = 3.84, df 2 = 5.99, df 3 = 7.81, df 4 = 9.49.
Answer every part to submit.