Question

a purebred plant that has yellow flowers is crossed with a purebred plant that has white flowers. all the offspring have yellow flowers. which conclusion about yellow flowers is supported by these results? yellow flower color is a dominant trait. yellow flower color is a recessive trait. yellow flower color is a heterozygous trait. yellow flower color is a monohybrid trait.

Explanation:

When purebred (homozygous) plants are crossed, if all offspring show one trait (yellow flowers here), according to Mendelian genetics, the trait that appears in the offspring (yellow) is the dominant trait. A recessive trait would not show up in the offspring when a purebred dominant - purebred recessive cross is done. A heterozygous trait refers to the genotype (e.g., \(Yy\)) not the nature of the trait itself. A monohybrid cross is a type of cross (involving one trait), not a description of the trait.

Answer:

Yellow flower color is a dominant trait.