A gardener plants a row of yellow flowers in her front yard. The next year, she notices that some of the new generation of flowers are yellow, while others are red. Which of the following best explains how this is possible?
A. The red flower allele must be recessive, because it hid behind the yellow allele.
B. The red flower color probably resulted from a mistake in the plant’s DNA.
C. The red flower color probably resulted when the yellow plant mixed its DNA with another species.
D. The red flower allele must be dominant, because it masked the yellow allele.