BI-352
Observed and expected ratios
Biology · Secondary 3 · Hard · Observed and expected ratios
A Punnett square predicts a 3 : 1 ratio of black : brown fur in 200 mouse offspring. One breeder breeds only 20 offspring and gets a 2 : 1 ratio. How can she obtain a ratio closer to 3 : 1 in her results?
- Breed a larger number of offspring using the same parents.
- Change one parent to a different genotype.
- Feed the mice differently so the expected ratio changes.
- Ignore the brown mice when calculating the ratio.
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