In a Plant, a Single Locus Affects Both Berry Color

question 23

Multiple Choice

In a plant, a single locus affects both berry color and berry size.There are two mutant alleles (R₁ and R₂) in addition to the wild-type allele (R₀) .Individuals that are R₀R₀ have large, white berries.Individuals that are R₁R₁ or R₀R₁ have red berries, individuals that are R₂R₂ or R₀R₂ have small berries, and R₁R₂ individuals have berries that are both red and small.Thus,

• A) R₁ is dominant to R₂.
• B) R₂ is dominant to R₁.
• C) R₁ and R₂ exhibit incomplete dominance.
• D) R₁ and R₂ exhibit pleiotropy.
• E) R₁ and R₂ exhibit codominance.

---

Definitions:

Expected Value

The predicted average of a random variable, calculated by multiplying each possible outcome by its probability and summing the results.

Random Variable

A variable whose possible values are numerical outcomes of a random phenomenon.

Regression Equation

A formula derived from regression analysis that predicts the dependent variable based on the values of one or more independent variables.

Regression Model

A statistical technique used to predict the value of a dependent variable based on the values of one or more independent variables.