BI-353
Observed and expected ratios
Biology · Secondary 3 · Hard · Observed and expected ratios
A class predicts a 1 : 1 ratio of red : white flowers from a cross. One group grows 8 plants and gets 3 red and 5 white. The teacher says, "The difference from 1 : 1 is due to chance." What does this mean?
- Which gametes fuse is random, so small numbers can give uneven ratios.
- The dominance of red over white changes after each fertilisation.
- Red flowers slowly turn white as the plant grows.
- The Punnett square method is wrong for predicting any ratios.
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