Figure 13.11
The F2 phenotypic ratio of 9:3:4, as shown above, 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
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A. Adenine B. Thymine C. Guanine D. Cytosine E. Uracil
A major function of the Casparian strip of the endodermal cells of a root is to
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