To determine which prediction about the heights of the three plants is the most reasonable, we need to understand the meaning of the genotypes provided:
- Plant A: tt (homozygous recessive)
- Plant B: TT (homozygous dominant)
- Plant C: Tt (heterozygous)
In pea plants, the tall height is typically dominant (T), while the short height is recessive (t). Here’s how the heights would generally compare:
- Plant B (TT) will be the tallest because it carries two dominant alleles.
- Plant C (Tt) will also be tall because it has one dominant allele and one recessive allele, but it may not be as tall as Plant B.
- Plant A (tt) will be the shortest since it carries two recessive alleles.
Based on this analysis, the most reasonable prediction is:
Plant A will be the tallest.
This prediction is not correct; thus, we eliminate it. Next, Plant B and Plant C will have similar heights is also not true since Plant B is likely taller than Plant C. The other two statements are also incorrect.
So, the most accurate prediction from your responses is: Plant C will be the shortest. - This is not correct as Plant A is the shortest.
Therefore, in this specific case based on typical genetic principles, it aligns with typical Mendelian genetics that Plant B will be the tallest.