When pea plants with white flowers are crossed with pea plants with red flowers, every offspring plant has red flowers. If these offspring plants are then crossed, the following generation includes both red-flowered and white-flowered plants. Which statement explains this?
- AThe allele for red flowers is dominant, and the offspring plants are heterozygous.
- BThe allele for red flowers is dominant, and the offspring plants are homozygous.
- CThe allele for red flowers is recessive, and the offspring plants are heterozygous.
- DThe allele for red flowers is recessive, and the offspring plants are homozygous.