Mendel's pea plants can have yellow peas or green peas. Mendel found the yellow pea color allele to be dominant over the green pea color allele. What does this mean?

The yellow allele masks the effects of the green allele in an individual heterozygous for pea color.

Both individuals who are heterozygous and homozygous dominant for pea color will have yellow peas.

Only individuals who are homozygous recessive for pea color will have green peas.

The green pea color allele can be found in some individuals but not expressed.

All of the above.