In Corn, Red Kernels (PP) Are Typically Dominant to White

question 22

Essay

In corn, red kernels (PP) are typically dominant to white kernels (pp). A red plant was crossed with a white plant to produce a Pp heterozygote with red kernels. However, in one ear of corn, a partially white kernel appeared unexpectedly. This kernel was grown into an adult plant, and for several generations of crosses, the offspring of this original kernel all had a mix of partially red and partially white kernels. However, when the seeds were grown in the presence of a demethylating drug, all of the resulting plants had red kernels. Explain why the mixed-color kernel appeared, why the offspring of this kernel also had the mixed-color phenotype, and why the demethylating drug had its effect.

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Definitions:

Persuasion Strategies

Persuasion strategies are techniques designed to change the beliefs, attitudes, or behaviors of others in a particular direction.

Cognitive Dissonance

A psychological phenomenon involving discomfort felt at conflicting beliefs, values, or attitudes, leading to an alteration in one of the conflicting factors.

Door-in-the-face Technique

A persuasion strategy where a large, likely-to-be-rejected request is followed by a smaller, more reasonable request.

Election Sign

A physical marker or poster designed to promote or indicate support for a particular candidate or political position during electoral campaigns.