The F2 phenotypic ratio of 9:3:4 is a result of a cross

involving
a. two genes expressing complete dominance.
b. a gene expressing dominance and another gene
expressing codominance.
c. two genes expressing codominance.
d. epistasis, in which one gene modifies the
expression of the other gene.
e. multiple alleles.


Answer: d

Biology & Microbiology

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