A plant with yellow flowers was crossed with a plant with red flowers. All of the numerous offspring had red flowers. What does this show about the genotype of the parental plant with yellow flowers?

• It is homozygous dominant.
• It is heterozygous dominant.
• It is homozygous recessive or heterozygous.
• It is homozygous dominant or heterozygous.
• It is homozygous recessive.