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.

Explanation:

Mendel's experiments showed that when a homozygous dominant (TT - tall) and homozygous recessive (tt - short) are crossed, the offspring (Tt) show the dominant trait (tall). This is because the dominant allele (T) masks the recessive allele (t). The word homozygous just means having two of the same alleles (either both dominant or both recessive), so the statement "The word homozygous always means dominant" is wrong. Recessive alleles (like t) are also passed on to offspring (as seen in the t from the short parent), so "Only dominant alleles are passed on to offspring" is incorrect. The offspring alleles (Tt) have a dominant (T) and recessive (t), so they are not all recessive.

Answer:

Tallness is a dominant trait.