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Practice MCAT Question - Q153

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

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