To determine the most reasonable prediction about the heights of the three pea plants based on their genotypes, we need to analyze the given genotypes:
- Plant A: tt (homozygous recessive)
- Plant B: TT (homozygous dominant)
- Plant C: Tt (heterozygous)
In pea plants, the allele for height typically exhibits a dominance relationship where the tall allele (T) is dominant over the short allele (t). Therefore:
- Plant A (tt) will be short because it has two recessive alleles.
- Plant B (TT) will be tall because it has two dominant alleles.
- Plant C (Tt) will also be tall because it has one dominant allele.
Based on this information, the predictions about heights can be evaluated:
- Plant C will be the shortest: False (Plant C is tall).
- Plant B and Plant C will have similar heights: True (both are tall).
- Plant A and Plant C will have similar heights: False (Plant A is short).
- Plant A will be the tallest: False (Plant A is the shortest).
Thus, the most reasonable prediction is: Plant B and Plant C will have similar heights.