A student selects a random pea plant from Mendel's garden. She notes that the plant has red leaves, but all other plants in the garden have green leaves. She presents the plant to Mendel, who claims that he has never seen a plant with red leaves before. What phenomenon is most likely responsible for the red leaf phenotype?
- A recombination event, resulting in a new allele
- A recessive allele
- Incomplete dominance
- A mutation, resulting in a new allele