Question

Which best describes a recessive allele?

always inherited from a parent when a dominant allele is inherited from the other parent
never inherited from a parent when a dominant allele is inherited from the other parent
only determines phenotype when a dominant allele for the same trait is present
does not determine phenotype when a dominant allele for the same trait is present

Answer 1

thoughts on this one?

remember that a dominant allele will "mask" the effect of a recessive allele (i.e. if you have Tt for height where T = allele for tallness and t = allele for shortness, Tt will result in a tall plant, "masking" the short trait)