Question

Gregor Mendel crossed homozygous tall plants (TT) with homozygous short plants (tt). All the resulting offspring were tall. From these results, what conclusion did Mendel draw?
Tallness is a dominant trait.
The word homozygous always means dominant.
Only dominant alleles are passed on to offspring.
The alleles of the offspring were recessive.

Answer 1

Tallness is a dominant trait.

Explanation: Crossing TT (homozygous dominant) with tt (homozygous recessive) gives all Tt offspring, which show the tall phenotype because the T (dominant) allele masks the t (recessive) allele. The other statements are incorrect.