WAEC Agriculture 2011 Paper

Concept:Tallness $(T)$ is dominant over dwarfness $(t)$, so the cross between homozygous tall $(TT)$ and dwarf $(tt)$ gives offspring that all show the dominant tall trait.Explanation:The tall parent $(TT)$ produces only gametes carrying $T$.The dwarf parent $(tt)$ produces only gametes carrying $t$.When these gametes fuse, every offspring receives one $T$ and one $t$.So the resulting genotype is $Tt$ for all offspring.$$TT \times tt \rightarrow Tt$$Because $T$ is dominant, each $Tt$ plant appears tall.Therefore, the entire generation is tall.Answer:100% tall