The genus of a snapdragon is called "antirrhinum." The species is known as "snapdragon." The genus includes lots of other shrubs and flowers, but the snapdragon is the only one located in North America.
If there is incomplete dominance, the offspring will have an intermediate of phenotype. For example, if you mate a homozygous white flowered snapdragon plant with a homozygous red flowered snapdragon plant, you will get pink flowered offspring.
A snapdragon is an example of an incomplete dominance because when a snapdragon plant having red flowers is crossed with another plant having white flowers, all F1 plants bear red flowers but in F2 generation, the plant population segregates in to 1 red : 2 pink : 1 white flowered plants ratio.
Genus is one of the levels we use to classify living things. It comes between family and species. Members of the same genus are closely related but not identical types of animal or plant. For instance lions (Panthera leo) and tigers (Panthera tigris) both belong to the genus Panthera.