Four-Leaf Clover Gene Found

Most of us know that the flour-leaf clover is a rare variation of the common three-leaf clover. It's said that you will have good luck if you come across a four-leaf clover. If you didn't believe the tradition, you might now. Scientists reported a gene that can associated with the rarity of the four-leaf clover. "The allele for the three-leaf trait masks the expression of the four-leaf trait".

http://www.biology-online.org/articles/four-leaf-clover-gene-found-researchers.html