An allele that exerts its effects whenever it is present is:

The pea plant (Pisum sativum) is a good choice for studying heredity because it:

If the two alleles for a particular gene are identical the gene pair is:

If an individual is homozygous for a particular trait:

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?