The dominant allele is represented by a Capital letter. Two alleles are necessary to express a trait. A wrinkled skinned pea plant is crossed with a smooth skinned pea plant. The wrinkled skinned pea plant is homozygous dominant, whereas the smooth skinned pea plant is homozygous recessive. What are the possible phenotype and genotypes for the offspring.
Lethal alleles can be dominant or recessive, but mor often they are recessive.
Two copies of the lethal allele will result in early death. With incomplete dominance, a cross between organisms with two different phenotypes produces offspring with a third phenotype that is a blending of the parental traits. The trick is to recognize when you are dealing with a question involving incomplete dominance. In a carnation field there are red carnations and white carnations. This results in RW offspring which are pink in color.