MCAT Question A Day - 5/1/13
The gene A leads to the production of a blue plant pigment, while the gene B leads to the deposition of that blue pigment in the petals of the flower. If a dihybrid cross of two heterozygotes (AaBb x AaBb) produces some offspring with blue petals and others with white petals in a phenotypic ratio of 9:7, what genetic phenomenon is the most likely explanation?
A. Pleiotropy
B. Linkage
C. Epistasis
D. Polygenic inheritance
